One Step Equations with Addition

9 + x = 18

• 10

• 8

• 9

• 2

7 + x = 15

• 22

• 9

• 8

• 6

17 = x + 3

• x = 20

• x = 14

• x = 13

• x = 19

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.

Solve the equation.

x + 9 = -5

Mathematical Equivalence

OFF

Choose the correct step to solve:

• Plus 13 on both sides

• Plus 7 on both sides

• Minus 13 on both sides

• Minus 7 on both sides

Choose the correct step to solve:

• Plus 9 on both sides

• Plus 5 on both sides

• Minus9 on both sides

• Minus 5 on both sides

Why do you add 7 to both sides?

• To undo addition, you subtract.

• To balance the equation, you subtract 7 on both sides.

• To undo subtraction, you add.

• To balance the equation,you add 7 to both sides.

Why do you subtract 14 on both sides?

• To undo addition, you subtract.

• To balance the equation, you subtract 14 on both sides.

• To undo subtraction, you add.

• To balance the equation,you add 14 to both sides.

Solve this equation.

• t = 7

• t = 10

• t = 17

• t = 3