Equations and Inequalities

Is x = 12 a solution of x + 15 = 4

• YES

• NO

Oliver had $43. On his birthday, he received $25. Write an equation to find how much money Oliver has now. Use b as the variable.

Mathematical Equivalence

ON

Greta cut a ribbon into 12 pieces. Each piece was 6 inches long. Use the model below to write an equation to find the length of the ribbon she started with. Use a as the variable.

Mathematical Equivalence

ON

Graph the equation y = x + 2

The table show how much Eric earns. Write an equation that relates a, the number of hours worked to b, his pay.

Mathematical Equivalence

ON

Andrew has saved $55 toward the purchase of an IPOD. The IPOD costs $145. Which equation represents the amount Andrew needs to save to by the IPOD?

• 55 + x = 145

• 145x = 55

• 55 - x = 145

• 145 (55) = x

x ÷ 13 = 8

• x = 91

• x = 104

• x = 21

• x = 5

What is the inverse operation needed to solve for p?
765 = p - 254

• subtraction

• addition

• multiplication

• division

Sally bought three candy bars for a total of $18.00. How much did each candy bar cost? Write an equation to solve this problem. Use c as your variable.

• 18c=6

• c + 6= 18

• c +18 = 6

• 3c=18

Robin made $24.00 one weekend and some money, m, the next. She made a total of $65.00. How much money did Robin make the second weekend? Using m as your variable write an equation to solve this problem.

• 24m=65

• m/24=65

• m+24=65

• m-24=65