9.7 Solve a formula for a specific variable  (Page 3/9)

Use the formula $A=\frac{1}{2}bh$ to solve for $\mathrm{h:}$

1. ⓐ when $A=170$ and $b=17$
2. ⓑ in general

Use the formula $A=\frac{1}{2}bh$ to solve for $b\text{:}$

1. ⓐ when $A=62$ and $h=31$
2. ⓑ in general

Use the formula $I=Prt.$

Find $t\text{:}$ ⓐ when $I=\text{\$2,160},r=\text{6\%},P=\text{\$12,000;}$ ⓑ in general

Use the formula $I=Prt.$

Find $r\text{:}$ ⓐ when $I=\text{\$5,400},P=\text{\$9,000},t=5\text{years}$ ⓑ in general

Solve the formula $3x+4y=10$ for $y\text{:}$

1. ⓐ when $x=2$
2. ⓑ in general

Solve the formula $5x+2y=18$ for $y\text{:}$

1. ⓐ when $x=4$
2. ⓑ in general

Solve the formula $P=a+b+c$ for $b\text{.}$

Solve the formula $P=a+b+c$ for $c\text{.}$

Solve the formula $7x+y=11$ for $y.$

Solve the formula $11x+y=8$ for $y.$

Solve the formula $4x+7y=9$ for $y.$

Solve the formula $5x+8y=1$ for $y.$