Question

Help solve these using the addition and multiplication properties of equality

Answer 1

#19

-4/5x=8

-4(x)/5=8

-4x/5=8

Multiply both sides by

-4x=8(5)

-4x=40

Divide both sides by -4

X= -10

#21

-4/3x+5=7

Multiply both sides by 3

-4/3x(3)+5(3)=7(3)

-4x+15=21

-4x=21-15

-4x=6

X=6/-4

X=-3/2