Solving Equations Simple

Solve the equation:
-5x = 25

• x = 20

• x = -20

• x = -5

• x = 5

• -12

• 12

• 6

• -6

A coupon subtracts $17.95 from the price of a pair of headphones. You pay $71.80 for the headphones after using the coupon. Write and solve an equation to find the original price p of the headphones.

• p + 17.95 = 71.80 , p = $53.85

• p - 17.95 = 71.80 , p = $89.75

• p + 71.80 = 17.95 , p = $-53.85

Tyrell has saved $62 to buy a new phone. How many more dollars must Tyrell save if the cost of the phone is $89? Let d be the number of dollars Tyrell must still save?

• 62 + d = 89

• 62d = 89

• d ÷ 89 = 62

• d - 62 = 89

30 = x - 12

Mathematical Equivalence

ON

3x = 18

Mathematical Equivalence

OFF

m - 3/18 = 11/18 (a)  

• 4/9

• 7/9

• 8/18

• 14/18

x - 17.6 = 1.9

Mathematical Equivalence

ON

What is the solution to the equation: x + 5 = 12?

Mathematical Equivalence

ON

x + 9 = 12 (a)  

• x = 21

• x = 3

• x = -20

• x = 12