Question

Resolva os sistemas

Answer 1

c) -y=13-2x (-1)

y=-13+2x                 y=-13+2.35/8

4.{x+( -13+x)/3}=18  y=-13+35/4

4.{3x-13+x}=18        y=-52+35

4.{4x-13}=18            y=-17

16x-52=18

x=18+52/16

x=70/16

x=35/8