5.7 Subtract Linear Expressions Objective:​
to subtract linear expressions ★ ​
When subtracting linear expressions, subtract like terms. Use zero pairs if needed. Examples: a) (5x − 9) − (2x − 7) b) (6x − 10) − (2x − 8) c) (3x − 2) − (5x − 4) d)
e)
(4x − 4) − (− 2x + 2) (4x − 3) − (2x + 7) f)
(5x − 4) − (2x + 3) Guided practice: p.406, #1 ­ 4 all HW: p. 407 ­ 410, #1 ­ 14 all, and #26 ­ 35 all Guided practice: 1. 3x − 1 2. − x + 10 3. − 2x + 14 ; 2 runs 4. If you multiply the second linear expression by ­1, it makes it simpler to line up the like terms and add. Example Answer Key: a) 3x − 2 b) 4x − 2 c) − 2x + 2 d) 6x − 6 e) 2x − 10 f)
3x − 7