1. 1.7 Solving Equations by
Adding or Subtracting

2. Vocabulary
equation: a mathematical statement
that uses an equal sign to show
that two expressions have the
same value.
inverse operation: opposite operation
(undo each other)

3. Ex. 1: Determine which
value is a solution
x + 8 = 15 ; x = 5, 7, or 23

4. Ex. 2: Solve
10 + n = 18 p–8=9

5. Ex. 3: Problem Solving
Jan and Alex are arguing over
who gets to play a board game. If
Jan, on the right, pulls with a
force of 14N, what force is Alex
exerting on the game if the net
force is 3N?