Chapter 3 Review

5n = 30

• 8

• 12

• 6

• 5

n/2 = 5

• 10

• 2

• 5

• 20

In the equation
x + 7 = 12
7 is being added to the variable, x. How should you show your work to isolate the variable and solve the equation? 

• Subtract 7 from both sides. The solution is x = 5.
• Add 7 to both sides.
  The solution is x = 19.
• Multiply both sides by 7 The solution is x = 84.

Solve for x:

x + 19.46 = 245.3

• 264.76

• 12.6

• 50.7

• 225.84

• 100

• 120

• 4

• 5

x - 32 = 49

• x = 17
• x = 71
• x = 81
• x = 49

• x = 30

• x = 23

• x = 30

• x = 19

• x = 30

• x = 13

• x = 7

• x = 3.33

-9x + 1 = -80

• -9

• 9

• 6

8 + b/-4 = 5

• 12

• -12

• 6