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Wiskunde

Voorspellings, vergelykings en veranderlikes

Opvoeders afdeling

Memorandum

14. (a) 100

(b) 12

(c) 124

(d) 8

15. (a) 10 99 75 5

(c)

______ 8 ______ 21
39 ______ 74 ______

16.2 (a) 5 х + 7 = 22

(b) 8 х - 10 = 46

(c) 5 + 9 х = 59

(d) х - 13 = 6

16.3 (a) 21

(b) 17

(c) 34

18 (a) 72 (j) 30

(b) 12 (k) 5

(c) 7 (l) 57

(d) 141 000 (m) 9

  1. 900 (n) 9 987
  2. 47 (o) 125

(g) 135

(h) 336

(i) 7

20. (a) х >10

(b) y <2 000

(c) ( c +8)>6

(d) y <50

(e) k – ( k ÷ 2)<20

Leerders afdeling

Inhoud

Aktiwiteit: voorspellings, vergelykings en veranderlikes (algebraïese vergelyking) [lu 1.7.2, lu 1.9.1, lu 1.10, lu 2.5]

14. Vervang nou die letters deur die korrekte getalle in die volgende vloeidiagram:

15. Legkaarte!

a) Kan jy die volgende raaisels oplos?

Ek dink aan ’n sekere getal. As ek die getal met 7 vermenigvuldig, dan 6 aftrek en die antwoord wat ek kry deur 8 deel, is die kwosiënt 8. Aan watter getal dink ek?

____________________________________________________________________

Ek het 9. As ek dit met 12 vermenigvuldig, dan 2 bytel en weer 11 aftrek, is die antwoord _____________________________________________________________

Wat sal die antwoord wees as ek met 7 begin? _______________________________

En as ek met 5 begin? __________________________________________________

b) Ons kan ’n tabel opstel om ons met probleme soos dié hierbo te help.

Getalle 9 7 5
Getalle × 12 + 2 – 11 99 75 51

c) Ons kan die woord “getal” deur enige letter van die alfabet vervang. Kan jy die ontbrekende getalle in die volgende tabel inskryf?

k 6 ________ 13 _________
(k × 5) + 9 49 114

d) Verduidelik aan ’n maat hoe jy bogenoemde antwoorde gekry het.

16.1 Het jy geweet?

Ons noem die stelling (k × 5) + 9 = 49 ’n algebraïese vergelyking . “Algebra” beteken “die studie van getallesinne”.

16.2 Skryf nou ’n algebraiëse vergelyking vir die volgende:

a) ’n Sekere getal x 5 + 7 = 22

____________________________________________________________________

b) 8 x ’n getal – 10 = 46 ______________________________________

c) 5 + (9 x ’n getal ) = 59 _______________________________________

d) Wanneer 13 van ’n groter getal afgetrek word, is die verskil 6.

_____________________________________________________________________

16.3 Los die volgende vergelykings op: (Jy mag jou sakrekenaar gebruik).

a) 49 x a – 29 = 1 000

_____________________________________________________________________

b) (b + 15) x 6 = 192

_____________________________________________________________________

c) 16 x c – 15 = 529

_____________________________________________________________________

17. Het jy geweet?

Die letters wat in die plek van enige getal staan, word veranderlikes genoem.

18. Kom ons kyk nou eers hoe vaar jy in jou volgende hoofrekentoets.

a) 9 x 8 = ___________________________

b) ___________________________ x 4 = 48

c) 4 x ___________________________ = 28

d) 6 x 235 x 100 = ______________________

e) 25 x 9 x 4 = _________________________

f) 16 + 17 + 14 = ______________________

g) 104 + 15 + 16 = _____________________

h) Verdriedubbel: 112: = _____________________

i) 42 ÷ 6 = ___________________________

j) ___________________________ ÷ 6 = 5

k) 35 ÷ ___________________________ = 7

l) (7 x 3) + (4 x 9) =_______________________

m) 4 x 9 + ___________________________ = 45

n) 10 000 – 13 = ___________________________

o) 5 tot die krag van 3 = _______________________

15

19. Het jy geweet?

Wanneer ons>en<-tekens in getallesinne gebruik, bv. as ons wil sê ’n getal gedeel deur 4 is kleiner as 5, sal ons dit so skryf:

y ÷ 4<5

As ons bv. wil sê ’n getal vermenigvuldig met 5 is groter as 16, sal ons dit so skryf:

b x 5>16

Ons noem getallesinne soos hierdie wat nie = -tekens het nie, ongelykhede.

20. Skryf die volgende woordsinne as getallesinne deur gebruik te maak van ongelykhede:

a) Die getal lekkers wat ek het, is meer as 10.

_____________________________________________________________________

b) Die getal leerders in ons skool is minder as 2 000.

_____________________________________________________________________

c) ’n Getal, vermeerder met 8, is groter as 6.

_____________________________________________________________________

d) Daar is minder as 50 leerders in ons klas.

_____________________________________________________________________

e) As ek die helfte van my albasters weggee, sal ek minder as 20 hê.

_____________________________________________________________________

Assessering

Leeruitkomste 1: Die leerder is in staat om getalle en die verwantskappe daarvan te herken, te beskryf en voor te stel, en om tydens probleemoplossing bevoeg en met selfvertroue te tel, te skat, te bereken en te kontroleer.

Assesseringstandaard 1.7: Dit is duidelik wanneer die leerder skat en bereken deur geskikte bewerkings vir probleme wat die volgende behels, te kies en te gebruik:

1.7.2: veelvoudige bewerkings met heelgetalle;

1.7.7: eksponente;

Assesseringstandaard 1.10: Dit is duidelik wanneer die leerder ‘n verskeidenheid strategieë gebruik om oplossings te kontroleer en die redelikheid daarvan te beoordeel.

Leeruitkomste 2: Die leerder is in staat om patrone en verwantskappe te herken, te beskryf en voor te stel en probleme op te los deur algebraïese taal en vaardighede te gebruik.

Assesseringstandaard 2.1: Dit is duidelik wanneer die leerder ‘numeriese en meetkundige patrone ondersoek en uitbrei op soek na ‘n verwantskap of reëls, insluitend patrone;

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder ‘voorstellings maak van en verwantskappe tussen veranderlikes gebruik sodat inset- en/of uitsetwaardes op ‘n verskeidenheid maniere bepaal kan word deur die gebruik van:

2.3.2: vloeidiagramme;

2.3.3: tabelle;

Assesseringstandaard 2.5: Dit is duidelik wanneer die leerder getalsinne oplos of voltooi deur inspeksie of deur ‘n proses van probeer en verbeter, en die oplossings deur vervanging kontroleer (bv. 2 x - 8 = 4).

Questions & Answers

how did you get 1640
Noor Reply
If auger is pair are the roots of equation x2+5x-3=0
Peter Reply
Wayne and Dennis like to ride the bike path from Riverside Park to the beach. Dennis’s speed is seven miles per hour faster than Wayne’s speed, so it takes Wayne 2 hours to ride to the beach while it takes Dennis 1.5 hours for the ride. Find the speed of both bikers.
MATTHEW Reply
420
Sharon
from theory: distance [miles] = speed [mph] × time [hours] info #1 speed_Dennis × 1.5 = speed_Wayne × 2 => speed_Wayne = 0.75 × speed_Dennis (i) info #2 speed_Dennis = speed_Wayne + 7 [mph] (ii) use (i) in (ii) => [...] speed_Dennis = 28 mph speed_Wayne = 21 mph
George
Let W be Wayne's speed in miles per hour and D be Dennis's speed in miles per hour. We know that W + 7 = D and W * 2 = D * 1.5. Substituting the first equation into the second: W * 2 = (W + 7) * 1.5 W * 2 = W * 1.5 + 7 * 1.5 0.5 * W = 7 * 1.5 W = 7 * 3 or 21 W is 21 D = W + 7 D = 21 + 7 D = 28
Salma
Devon is 32 32​​ years older than his son, Milan. The sum of both their ages is 54 54​. Using the variables d d​ and m m​ to represent the ages of Devon and Milan, respectively, write a system of equations to describe this situation. Enter the equations below, separated by a comma.
Aaron Reply
find product (-6m+6) ( 3m²+4m-3)
SIMRAN Reply
-42m²+60m-18
Salma
what is the solution
bill
how did you arrive at this answer?
bill
-24m+3+3mÁ^2
Susan
i really want to learn
Amira
I only got 42 the rest i don't know how to solve it. Please i need help from anyone to help me improve my solving mathematics please
Amira
Hw did u arrive to this answer.
Aphelele
hi
Bajemah
-6m(3mA²+4m-3)+6(3mA²+4m-3) =-18m²A²-24m²+18m+18mA²+24m-18 Rearrange like items -18m²A²-24m²+42m+18A²-18
Salma
complete the table of valuesfor each given equatio then graph. 1.x+2y=3
Jovelyn Reply
x=3-2y
Salma
y=x+3/2
Salma
Hi
Enock
given that (7x-5):(2+4x)=8:7find the value of x
Nandala
3x-12y=18
Kelvin
please why isn't that the 0is in ten thousand place
Grace Reply
please why is it that the 0is in the place of ten thousand
Grace
Send the example to me here and let me see
Stephen
A meditation garden is in the shape of a right triangle, with one leg 7 feet. The length of the hypotenuse is one more than the length of one of the other legs. Find the lengths of the hypotenuse and the other leg
Marry Reply
how far
Abubakar
cool u
Enock
state in which quadrant or on which axis each of the following angles given measure. in standard position would lie 89°
Abegail Reply
hello
BenJay
hi
Method
I am eliacin, I need your help in maths
Rood
how can I help
Sir
hmm can we speak here?
Amoon
however, may I ask you some questions about Algarba?
Amoon
hi
Enock
what the last part of the problem mean?
Roger
The Jones family took a 15 mile canoe ride down the Indian River in three hours. After lunch, the return trip back up the river took five hours. Find the rate, in mph, of the canoe in still water and the rate of the current.
cameron Reply
Shakir works at a computer store. His weekly pay will be either a fixed amount, $925, or $500 plus 12% of his total sales. How much should his total sales be for his variable pay option to exceed the fixed amount of $925.
mahnoor Reply
I'm guessing, but it's somewhere around $4335.00 I think
Lewis
12% of sales will need to exceed 925 - 500, or 425 to exceed fixed amount option. What amount of sales does that equal? 425 ÷ (12÷100) = 3541.67. So the answer is sales greater than 3541.67. Check: Sales = 3542 Commission 12%=425.04 Pay = 500 + 425.04 = 925.04. 925.04 > 925.00
Munster
difference between rational and irrational numbers
Arundhati Reply
When traveling to Great Britain, Bethany exchanged $602 US dollars into £515 British pounds. How many pounds did she receive for each US dollar?
Jakoiya Reply
how to reduced echelon form
Solomon Reply
Jazmine trained for 3 hours on Saturday. She ran 8 miles and then biked 24 miles. Her biking speed is 4 mph faster than her running speed. What is her running speed?
Zack Reply
d=r×t the equation would be 8/r+24/r+4=3 worked out
Sheirtina
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Source:  OpenStax, Wiskunde graad 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
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