Question

2y-y=0
y+y=15


x-y=6
x+y=-7


me ajude nesses métodos

Answer 1

Boa noite

2x - y = 0
  x + y = 15  

3x = 15
x = 5

5 + y = 15
y = 10

S = (5,10)

x - y = 6
x + y= -7

2x = -1
x = -1/2

y = x - 6
y = -1/2 - 12/2 = -13/2 

S = (-1/2, -13/2)