Solving Equations with Two Steps

You bought a magazine for $5 and four erasers. You spent a total of $25. How much did each eraser cost?  (Define 'n' and write the equation.) 

• n=total cost of erasers; 5 + 4n = 25

• n=cost of 1 eraser; 5 - 4n = 25

• n=cost of 1 eraser; 5n + 4 = 25

• n=cost of 1 eraser; 5 + 4n = 25

Bonnie spent half of her weekly allowance playing mini-golf. To earn more money her parents let her wash the car for $4. What is her weekly allowance if she ended with $12? (Define 'n' and write the equation.)

• n=wkly allowance; 2n-4=12

• n=wkly allowance; 2n+4=12

• n=wkly allowance; n/2-4=12

• n=wkly allowance; n/2+4=12

Speedy Boat Rental charges a $15 deposit fee plus $2 for each hour of use to rent a paddle boat.  Write an equation to find out how many hours, h, they rented the Boat if the total cost was $33.

• h = 2(9) + 15

• 33 = 15h + 2

• h = 15(9) + 2

• 33 = 2h + 15

Twice a number plus 6 is -72

• 2 + 6x =- 72

• 2x + 6 = -72

• 2 + 6 = x

• 2x² + 6 = 72

Ken is thinking of a number. Nine more than the product of 4 and the number is 73. What is the equation?

• 4 + 9x = 73

• 4x = 73

• 4x + 9 = 73

• 9x + 4 = 73

3 + (¹∕₄)a = 31

• a= 28

• a= 112

• a= 7

• a= 67

3c + 5 = 23

• c = 3

• c = 6

• c = 7

• c = 18

-4x+1=21

• x=120

• x=5

• x=30

• x=-5

3f - 12 = -3

• 3

• -3

• 11

• 12

2k + 12 = -4

• -8

• 8

• -10

• 4