Verified answer

.08y + .12(1000-y) = 960

First distribute the .12

.08y + 120 - .12y = 960

Combine .08y and -.12y

-.04y + 120 = 960

Subtract 120 from each side

-.04y = 840

Divide both sides by -.04

y = 840/-.04

Answer: y = -21000

0.08y+0.12(1000-y)=960

.08y+120-.12y=960

-.04y=840

y=840/(-.04)=-21000

.08y+.12(1000-y)=960

8y+12(1000-y)=9600

8y+12000-12y=9600

-4y=-2400

y=600