Adding & Subtracting One-Step Equations (7th)

Summarize how you solve the equation below.

50 = 12 + x

• Subtract 12 from both sides of the equation. (take 12 from the 12 +x side and take 12 away from 50)

• Subtract 12 from the right side of the equation. (just take 12 away from the 12 + x side)

• Subtract 50 from both sides of the equation. (take 50 away from the 12 +x side and 50 away from 50)

• Combine 50 and 12

Solve the equation.
46 = n + 19

• n = 37
• n = 27
• n = 65
• n = 30

Which equation represents the question?

The average length of a King Cobra is 118 inches, which is 22 inches longer than a Black Mamba. What is the average length of a Black Mamba (m)?

• 118 + 22 = m

• m + 22 = 118

• m - 22 = 140

• 118 = 22 - m

Solve the equation

y + 8.3= 12.7

• 28

• 21

• 4.2

• 4.4

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.

x + 9 = 12

• x = 21
• x = 3
• x = -20
• x = 12

What is the correct step to solve for the variable?
15 = m - 5

• add 15 to both sides
• add 5 to both sides
• subtract 15 from both sides
• subtract 5 from both sides

y - 33 = 147

• y = 114
• y = 177
• y = 180
• Answer not Given

1/4 + b = 3/4

• 2/4
• 1
• 1/2

m - 3/18 = 11/18

• 4/9
• 7/9
• 8/18
• 14/18