Adding and Subtracting Equations

w - 99 = 100

• w = 199

• w = 200

• z = 199

• w = 1

p - 40 = 0

• p = 45

• p = 0

• p = 40

• p = 42

Jennifer has $14. she sold a notebook and pen, and now she has $18. Solve the equation 14 + m = 18 to find how much money Jennifer received by selling the notebook and pen.

• m = 4

• m = 32

• m = 38

• m = 6

What step can be taken to get the x by itself on one side in the equation x + 18 = 50 ?

• Multiply both sides of the equation by 18

• Divide both sides of the equation by 18

• Add 18 to both sides of the equation

• Subtract 18 from both sides of the equation.

a - 17 = 9

• a = 36

• a = 14

• a = 26

• a = 32

57 + c = 93

• c = 37

• c = 97

• c = 36

• c = 27

9.5 + x = 14.2

• 4.7

• 23.7

Samuel bought a tire for $79.95 and some rims. He spent a total of $534.85. Which equation could be used to find the cost of the rims, r, Samuel bought?

• 79.95 - r = 534.85

• r - 79.95 = 534.85

• r + 79.95 = 534.85

• 534.85 + 79.95 = r

On his lunch break, Crosby purchases a piece of pizza for $6.30 and a salad. The total order is $9.25. Which equation could be used to find the cost of the salad?

• x + 6.30 = 9.25

• x - 6.30 = 9.25

• x + 9.25 = 6.30

• x - 9.25 = 6.30

Which equation best matches the picture?

• 12 + 4 = m

• m + 12 = 4

• 4 + m = 12