Adding and Subtracting Equations

s + 42 = 75

• 33

• 117

• 36

• 43

17-k=10

• 6

• 7

• 8

• 9

100+e=201

• 100

• 101

• 0

• 99

a+19=50

• 21

• 31

• 44

• 11

x + (-18) = 34

Mathematical Equivalence

ON

Solve the equation.

x + 9 = -5

Mathematical Equivalence

OFF

v+10=30

• 10

• 0

• 20

• 43

5 + a = 37

• a = 37/5

• a = 42

• a = 185

• a = 32

What is the correct first step in solving this equation: y - 12 = 20

• add 12 to both sides of the equation

• subtract 12 from both sides of the equation

• add 12 to the left side of the equation only

• subtract 12 from the left side of the equation only

What is the value of "x" in this equation? 192 + x = 450

• x = 642

• x = 262

• x = 258

• x = 342