Question

Solve each of the following equations for x. (a) 5x-7=28 (b) 12-5x= x+30 (c) 5(x+2)= 1-3x
Зx-y=-5 X+2y=3

Answer 1

a) 5x-7=28

5x=35

x=7

b) 12-5x=x+30

-6x=18

x= -3

c) 5(x+2)=1-3x

5x+10=1-3x

8x= -9

x= -9/8

d) $\left \{ {{3x-y=-5} \atop {x+2y=3}} \right.$

$\left \{ {{y=5+3x} \atop {x+2y=3}} \right.$

x+2(5+3x)=3

x= -1

y=5+3(-1)

y=2