Question

resolva os sistemas {3x + 8 Y = 80
{5x-6y=-2

Answer 1

3x + 8 Y = 80.(-5)
5x-6y=-2.(3)

-15x-40y=-400
15x-18y=-6


15x-15x-40y-18y=-400-6

-58y=-406

y=-406/-58

y=7

5x-6y=-2

5x=-2+42

5x=40

x=40/5

x=8

espero ter lhe ajudado!