Question

solução (x,y) de cada 2x - y = 15 y = -3

Answer 1

2x -y = 15 
y = -3 

2x = 15+3
2x = 18: 2
x = 9

s(9:-3)

Answer 2

2x - y = 15 ==> 2x = 15 + y ==> 2x = 15 - 3 ==> 2x = 12 ==> x = 6

y = -3

V = {(6,-3)}