Question

Resolva a questao 2x+3y=20 3x+y=16 como fazer

Answer 1

{2x+3y=20 ×(-1)

{3x+y=16 ×(3)

{-2x-3y=-20

+{9x+3y=48

7x=28

x=28/7

x=4

3x+y=16

y=16-3x

y=16-3.4

y=16-12

y=4

s={4,4}