8:7-1Solving Two-Step Equations

vocab

• none

Solving equations

• x + 6 = 10 y – 5 = 23

Solving two-step equations• 3n – 7 = 8 2x + 1 = 5 x/4 + 6 = 9 • 3n – 7 + 7 = 8 + 7 2x + 1 – 1 = 5 – 1 x/4 + 6 – 6 = 9 - 6

• 3n = 15 2x = 4 x/4 = 3• 3n/3 = 15/3 2x/2 = 4/2 (x/4)*4 = 3*4• n = 5 x = 2 x = 12

Try these

• 5x + 7 = 12 6x – 3 = 39 y/4 + 8 = 12

Negative coefficients

• 5 – 2x = 7 -x – 3 = 8• 5 – 5 – 2x = 7 – 5 -x – 3 + 3 = 8 + 3• -2x = 2 -x = 11• -2x/-2 = 2/-2 -x/-1 = 11/-1• x = -1 x = -11

Try these• -a + 6 = 8 -9 – y/7 = -12

p. 346 # 15

Questions?

homework

• P. 346 #6-26 all skip #15