Answer
3a. y=-5
3b. a=4
Work Step by Step
3a.
$4(2y+1)=2(y-13)$
Expand: $8y+4=2y-26$
Subtract 4 from both sides: $8y+4-4=2y-26-4$
Simplify: $8y=2y-30$
Subtract 2y from both sides: $8y-2y=2y-30-2y$
Simplify: $6y=-30$
Divide both sides by 6: $\frac{6y}{6}=\frac{-30}{6}$
Simplify: $y=-5$
3b.
$7(4-a)=3(a-4)$
Expand: $28-7a=3a-12$
Subtract: $-7a=3a-40$
Subtract 3a froom both sides: $-7a-3a=3a-40-3a$
Simplify: $-10a=-40$
Divide both sides by -10: $\frac{-10a}{-10}=\frac{-40}{-10}$
Simplify: $a=4$
