Question

resolva o sistema 6x-3y=6
-5x+4y=-20

Answer 1

6x - 3y = 6 :(3)
-5x+4y = -20

2x - y = 2 .(4)
-5x+4y = -20

8x - 4y = 8
-5x+4y = -20
------------------
3x = -12
x = -12/3
x = -4

6x-3y = 6
6.(-4)-3y = 6
-24-3y = 6 . (-1)
24+3y = -6
3y = -6-24
3y = -30
y = -30/3
y = -10
S: {-4, -10}