Equations and Inequalities

Which equation represents "two times a number plus five is 15"?

• x + 5 = 15

• 2x + 5 = 15

• x + 2(5) = 15

• 2(x + 5) = 15

• 3

• 5

• 8

• 10

You are paid $10 per week to do the dishes and take out the trash. You get an additional $3.50 for every other chore you do. Which equation represents your money earned (y) for doing x chores?

• y = 3.5x

• y = 10 + x

• y = 10 + 35x

• y = 10 + 3.5x

• 12

• 13

• 20

• 27

The cost to rent a rug cleaner for a day is $25 plus $15 per hour.

Write an inequality that can be used to show how many hours (x) you can rent the rug cleaner for so that the charges will be less than $130.

Mathematical Equivalence

OFF

The cost to rent a rug cleaner for a day is $25 plus $15 per hour. Write an inequality that can be used to show how many hours (x) you can rent the rug cleaner for so that the charges will be less than $130.

Mathematical Equivalence

OFF

• -9

• -7

• 7

• 9

• add 2 to both sides

• subtract 2 from both sides

• subtract 2 from the left side and add 2 to the right side

• add 2 to the left side and subtract 2 from the right side

You need at least $130 to buy supplies for baseball. You already have $45 saved. Which inequality represents the remaining money you will need to earn?

You have a $15 iTunes gift card. You downloaded 12 songs that each cost the same price. After applying the discount from the gift card, your total cost is $8.88. Which equation can be used to find the price of each song?

• 12p - 15 = 8.88

• 8.88 - 12p = 15

• 12p + 8.88 = 15

• 15p + 12 = 8.88