Question

quanto que e a conta
x+2y=5
x+3y=8

3x+4y=14
2x-3y=7

3x+4y=+5
x-2y=5

x+3y=6
-4x+6y=1

-x-y=1
x-y=7

Answer 1

1=x+2y = 5
x +3y = 8

x = 5 - 2y

x +3y = 8
5-2y+3y = 8
y = 8-5
y = 3

x + 2y = 5
x + 2.3 = 5
x + 6 = 5
x = 5-6
x = -1                      x = -1 e y = 3