Question

{5x+5y = -10 {2x+3y = -13

Answer 1

Resposta:

{5x+5y = -10 .(-3)

{2x+3y = -13 .(5)

{-15x - 15y = 30

{10x + 15y = -65

-5x = -35

x = -35/-5

x = +7

substituir x para achar y

5x+5y = -10

5.7+5y = -10

35 + 5y = -10

5y = -10 -35

y = -45/5

y = -9

S = {7, -9}