1. Two-Step Equations Lesson 7-1

2. Steps to Solving Equations 1. “Balance Out” To shift terms of an equation around the “=“ by addition or subtraction Goal: to get variable terms on one side of “=“ and constants on the other 2. “Solve” Most often completed by multiplication or division

3. Two-Step Equations 3n – 6 = 15 + 6 +6 3n= 21 n = 7 y - 9 = -12 7 +9 +9 y = -3 7 7. y = -3 7 7 y = -21

4. Two-Step Equations *cannot have a negative variable 5 – m = 17 -5 -5 - m = 12 m = -12 * multiply/divide by (-1) on both sides 5 = -x + 10 3 -10 -10 -5 = -x 3 a) -15 = -x b) 15 = x 15 = x

5. Practice a) 15x + 3 = 48 b) t - 10 = -6 4 c) -a + 6 = 8 d) 13 – 6f = 31

6. Homework p. 338-339 #12-24 even, 42-44 all