One Step Equations (add and Subtract)

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.

x + 21 = 56; Solve for x.

•  x = 77
• x = 35
• x = 18
• x = 45

n - 13 = 8; Solve for n.

• n = 5
• n = -5
• n = 21
• n = -21

b + 22 = 89; Solve for b.

• b = 77
• b = 57
• b = 111
• b = 67

Solve the equation: x + 12 = 20

• x = 32

• x = -32

• x = 8

• x = -8

Solve the equation: y - 14 = 66

• 80

• 52

• 79

• Answer Not Given

Solve the equation: y + 23 = 54

• y = 12

• y = 31

• y = 44

• y = 53

Solve the equation: n - 43 = 102

• n = 112

• n = 321

• n = 145

• n = 123

x - 62 = 123
How should you show your work to isolate the variable and solve the equation?

• Add 62 to each side. 
• Subtract 62 from each side.
• Multiply each side by 62.
• Add 123 to each side.

What what is the inverse operation of subtraction?

• addition
• subtraction
• multiplication
• division