



In the following exercises, find the slope of each line.
Use the Slope Formula to find the Slope of a Line between Two Points
In the following exercises, use the slope formula to find the slope of the line between each pair of points.
Graph a Line Given a Point and the Slope
In the following exercises, graph each line with the given point and slope.
Everyday math
Slope of a roof. An easy way to determine the slope of a roof is to set one end of a 12 inch level on the roof surface and hold it level. Then take a tape measure or ruler and measure from the other end of the level down to the roof surface. This will give you the slope of the roof. Builders, sometimes, refer to this as pitch and state it as an “
$x$ 12 pitch” meaning
$\frac{x}{12}$ , where
$x$ is the measurement from the roof to the level—the rise. It is also sometimes stated as an “
$x$ in12 pitch”.

ⓐ What is the slope of the roof in this picture?

ⓑ What is the pitch in construction terms?
ⓐ
$\frac{1}{3}$
ⓑ 4 12 pitch or 4in12 pitch
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Road grade. A local road has a grade of 6%. The grade of a road is its slope expressed as a percent. Find the slope of the road as a fraction and then simplify. What rise and run would reflect this slope or grade?
$\frac{3}{50}$ ; rise = 3, run = 50
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Highway grade. A local road rises 2 feet for every 50 feet of highway.
ⓐ What is the slope of the highway?
ⓑ The grade of a highway is its slope expressed as a percent. What is the grade of this highway?
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Wheelchair ramp. The rules for wheelchair ramps require a maximum 1inch rise for a 12inch run.
ⓐ How long must the ramp be to accommodate a 24inch rise to the door?
ⓑ Create a model of this ramp.
ⓐ 288 inches (24 feet)
ⓑ Models will vary.
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Wheelchair ramp. A 1inch rise for a 16inch run makes it easier for the wheelchair rider to ascend a ramp.
ⓐ How long must a ramp be to easily accommodate a 24inch rise to the door?
ⓑ Create a model of this ramp.
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Writing exercises
What does the sign of the slope tell you about a line?
When the slope is a positive number the line goes up from left to right. When the slope is a negative number the line goes down from left to right.
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Self check
ⓐ After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.
ⓑ On a scale of 1–10, how would you rate your mastery of this section in light of your responses on the checklist? How can you improve this?
Questions & Answers
Bruce drives his car for his job. The equation R=0.575m+42 models the relation between the amount in dollars, R, that he is reimbursed and the number of miles, m, he drives in one day. Find the amount Bruce is reimbursed on a day when he drives 220 miles.
LeBron needs 150 milliliters of a 30% solution of sulfuric acid for a lab experiment but only has access to a 25% and a 50% solution. How much of the 25% and how much of the 50% solution should he mix to make the 30% solution?
hey everyone how to do algebra
Felecia answer 1.5 hours before he reaches her
I would like to solve the problem 6/2x
Does the x represent a number or does it need to be graphed ?
latonya
Arnold invested $64,000, some at 5.5% interest and the rest at 9%. How much did he invest at each rate if he received $4,500 in interest in one year?
Tickets for the community fair cost $12 for adults and $5 for children. On the first day of the fair, 312 tickets were sold for a total of $2204. How many adult tickets and how many child tickets were sold?
Threefourths of the people at a concert are children. If there are 87 children, what is the total number of people at the concert?
Erica earned a total of $50,450 last year from her two jobs. The amount she earned from her job at the store was $1,250 more than four times the amount she earned from her job at the college. How much did she earn from her job at the college?
Tsimmuaj
Erica earned a total of $50,450 last year from her two jobs. The amount she earned from her job at the store was $1,250 more than four times the amount she earned from her job at the college. How much did she earn from her job at the college?
Tsimmuaj
? Is there anything wrong with this passage
I found the total sum for 2 jobs, but found why elaborate on extra
If I total one week from the store *4 would = the month than the total is = x than x can't calculate 10 month of a year
candido
what would be wong
candido
87 divided by 3 then multiply that by 4. 116 people total.
Melissa
the actual number that has 3 out of 4 of a whole pie
candido
was having a hard time finding
Teddy
use Matrices for the 2nd question
Daniel
One number is 11 less than the other number. If their sum is increased by 8, the result is 71. Find the numbers.
26 + 37 = 63 + 8 = 71
gayla
how do we know the answer is correct?
Thisha
23 is 11 less than 37. 23+37=63.
63+8=71. that is what the question asked for.
gayla
23 +11 = 37. 23+37=63
63+8=71
Gayla
by following the question. one number is 11 less than the other number 26+11=37 so 26+37=63+8=71
Gayla
your answer did not fit the guidelines of the question 11 is 41 less than 52.
gayla
71811 =52 is this correct?
Ruel
let the number is 'x' and the other number is "x11". if their sum is increased means: x+(x11)+8 result will be 71. so
x+(x11)+8=71
2x11+8=71
2x3=71
2x=71+3
2x=74
1/2(2x=74)1/2
x=37 final answer
tesfu
Amara currently sells televisions for company A at a salary of $17,000 plus a $100 commission for each television she sells. Company B offers her a position with a salary of $29,000 plus a $20 commission for each television she sells. How televisions would Amara need to sell for the options to be equal?
company A 13 company b 5.
A 17,000+13×100=29,100
B 29,000+5×20=29,100
gayla
need help with math to do tsi test
Toocute
have you tried the TSI practice test ***tsipracticetest.com
gayla
DaMarcus and Fabian live 23 miles apart and play soccer at a park between their homes. DaMarcus rode his bike for 34 of an hour and Fabian rode his bike for 12 of an hour to get to the park. Fabian’s speed was 6 miles per hour faster than DaMarcus’s speed. Find the speed of both soccer players.
DaMarcus: 16 mi/hr
Fabian: 22 mi/hr
Sherman
Joy is preparing 20 liters of a 25% saline solution. She has only a 40% solution and a 10% solution in her lab. How many liters of the 40% solution and how many liters of the 10% solution should she mix to make the 25% solution?
32 is 40% , & 8 is 10 % , & any 4 letters is 5%.
Karen
It felt that something is missing on the question like:
40% of what solution?
10% of what solution?
Jhea
3% & 2% to complete the 25%
Sparcast
because she already has 20 liters.
Sparcast
ok I was a little confused I agree 15% & 5%
Sparcast
Jim and Debbie earned $7200. Debbie earned $1600 more than Jim earned. How much did they earned
Bebbie: 4,400 Jim: 2,800
Jhea
A river cruise boat sailed 80 miles down the Mississippi River for 4 hours. It took 5 hours to return. Find the rate of the cruise boat in still water and the rate of the current.
A veterinarian is enclosing a rectangular outdoor running area against his building for the dogs he cares for. He needs to maximize the area using 100 feet of fencing. The quadratic equation A=x(100−2x) gives the area, A , of the dog run for the length, x , of the building that will border the dog run. Find the length of the building that should border the dog run to give the maximum area, and then find the maximum area of the dog run.
Source:
OpenStax, Elementary algebra. OpenStax CNX. Jan 18, 2017 Download for free at http://cnx.org/content/col12116/1.2
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