### Review Exercises

## Solve Equations using the Subtraction and Addition Properties of Equality

**Verify a Solution of an Equation**

In the following exercises, determine whether each number is a solution to the equation.

$10x-1=5x;x=\frac{1}{5}$

$\mathrm{-12}n+5=8n;n=-\frac{5}{4}$

**Solve Equations using the Subtraction and Addition Properties of Equality**

In the following exercises, solve each equation using the Subtraction Property of Equality.

$x+7=19$

$a+\frac{1}{3}=\frac{5}{3}$

In the following exercises, solve each equation using the Addition Property of Equality.

$u-7=10$

$c-\frac{3}{11}=\frac{9}{11}$

In the following exercises, solve each equation.

$n-12=32$

$f+\frac{2}{3}=4$

**Solve Equations That Require Simplification**

In the following exercises, solve each equation.

$y+8-15=\mathrm{-3}$

$6(n-1)-5n=\mathrm{-14}$

**Translate to an Equation and Solve**

In the following exercises, translate each English sentence into an algebraic equation and then solve it.

The sum of $\mathrm{-6}$ and $m$ is 25.

**Translate and Solve Applications**

In the following exercises, translate into an algebraic equation and solve.

Rochelle’s daughter is 11 years old. Her son is 3 years younger. How old is her son?

Peter paid $9.75 to go to the movies, which was $46.25 less than he paid to go to a concert. How much did he pay for the concert?

Elissa earned $152.84 this week, which was $21.65 more than she earned last week. How much did she earn last week?

## Solve Equations using the Division and Multiplication Properties of Equality

**Solve Equations Using the Division and Multiplication Properties of Equality**

In the following exercises, solve each equation using the division and multiplication properties of equality and check the solution.

$8x=72$

$0.25p=5.25$

$\frac{n}{6}=18$

$36=\frac{3}{4}x$

$\mathrm{-18}m=\mathrm{-72}$

$0.45x=6.75$

**Solve Equations That Require Simplification**

In the following exercises, solve each equation requiring simplification.

$5r-3r+9r=35-2$

$\frac{11}{12}n-\frac{5}{6}n=9-5$

**Translate to an Equation and Solve**

In the following exercises, translate to an equation and then solve.

143 is the product of $\mathrm{-11}$ and *y*.

The sum of *q* and one-fourth is one.

**Translate and Solve Applications**

In the following exercises, translate into an equation and solve.

Ray paid $21 for 12 tickets at the county fair. What was the price of each ticket?

Janet gets paid $24 per hour. She heard that this is $\frac{3}{4}$ of what Adam is paid. How much is Adam paid per hour?

## Solve Equations with Variables and Constants on Both Sides

**Solve an Equation with Constants on Both Sides**

In the following exercises, solve the following equations with constants on both sides.

$8p+7=47$

$3x+19=\mathrm{-47}$

**Solve an Equation with Variables on Both Sides**

In the following exercises, solve the following equations with variables on both sides.

$7y=6y-13$

$k=\mathrm{-6}k-35$

**Solve an Equation with Variables and Constants on Both Sides**

In the following exercises, solve the following equations with variables and constants on both sides.

$12x-9=3x+45$

$4u+16=\mathrm{-19}-u$

## Use a General Strategy for Solving Linear Equations

**Solve Equations Using the General Strategy for Solving Linear Equations**

In the following exercises, solve each linear equation.

$6(x+6)=24$

$\text{\u2212}(s+4)=18$

$23-3(y-7)=8$

$4(3.5y+0.25)=365$

$8(r-2)=6(r+10)$

$(9n+5)-(3n-7)$

$=20-(4n-2)$

**Classify Equations**

In the following exercises, classify each equation as a conditional equation, an identity, or a contradiction and then state the solution.

$17y-3(4-2y)=11(y-1)$

$+12y-1$

$\mathrm{-8}(7m+4)=\mathrm{-6}(8m+9)$

## Solve Equations with Fractions and Decimals

**Solve Equations with Fraction Coefficients**

In the following exercises, solve each equation with fraction coefficients.

$\frac{2}{5}n-\frac{1}{10}=\frac{7}{10}$

$\frac{3}{4}a-\frac{1}{3}=\frac{1}{2}a-\frac{5}{6}$

$\frac{3x-2}{5}=\frac{3x+4}{8}$

**Solve Equations with Decimal Coefficients**

In the following exercises, solve each equation with decimal coefficients.

$0.8x-0.3=0.7x+0.2$

$0.6p-1.9=0.78p+1.7$

## Solve a Formula for a Specific Variable

**Use the Distance, Rate, and Time Formula**

In the following exercises, solve.

Natalie drove for $7\frac{1}{2}$ hours at 60 miles per hour. How much distance did she travel?

Mallory is taking the bus from St. Louis to Chicago. The distance is 300 miles and the bus travels at a steady rate of 60 miles per hour. How long will the bus ride be?

Aaron’s friend drove him from Buffalo to Cleveland. The distance is 187 miles and the trip took 2.75 hours. How fast was Aaron’s friend driving?

Link rode his bike at a steady rate of 15 miles per hour for $2\frac{1}{2}$ hours. How much distance did he travel?

**Solve a Formula for a Specific Variable**

In the following exercises, solve.

Use the formula. $d=rt$ to solve for *t*

ⓐ when $d=510$ and $r=60$

ⓑ in general

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

ⓐ when $A=390$ and $h=26$

ⓑ in general

Use the formula $I=Prt$ to solve for the principal, *P* for

ⓐ $I=\text{\$}2,501,r=4.1\%,$

$t=5\phantom{\rule{0.2em}{0ex}}\text{years}$

ⓑ in general

Solve $180=a+b+c$ for $c$.

## Solve Linear Inequalities

**Graph Inequalities on the Number Line**

In the following exercises, graph each inequality on the number line.

ⓐ $x\le 4$

ⓑ $x>-2$

ⓒ $x<1$

In the following exercises, graph each inequality on the number line and write in interval notation.

ⓐ $x<-1$

ⓑ $x\ge \mathrm{-2.5}$

ⓒ $x\le \frac{5}{4}$

**Solve Inequalities using the Subtraction and Addition Properties of Inequality**

In the following exercises, solve each inequality, graph the solution on the number line, and write the solution in interval notation.

$n-12\le 23$

$a+\frac{2}{3}\ge \frac{7}{12}$

**Solve Inequalities using the Division and Multiplication Properties of Inequality**

In the following exercises, solve each inequality, graph the solution on the number line, and write the solution in interval notation.

$9x>54$

$\frac{5}{2}j<-60$

**Solve Inequalities That Require Simplification**

In the following exercises, solve each inequality, graph the solution on the number line, and write the solution in interval notation.

$6p>15p-30$

$5n-15(4-n)<10(n-6)+10n$

**Translate to an Inequality and Solve**

In the following exercises, translate and solve. Then write the solution in interval notation and graph on the number line.

Five more than *z* is at most 19.

Nine times *n* exceeds 42.

## Everyday Math

Describe how you have used two topics from this chapter in your life outside of your math class during the past month.