Question

3x+y=12
x-5y=4
me ajudem

Answer 1

$3x + y = 12 \\ x - 5y =4 \\ x = 4 + 5y \\ 3(4 + 5y) + y = 12 \\ 12 + 15y + y = 12 \\ 16y = 0 \\ y = 0 \\ x = 4 + 5 \times 0 \\ x = 4$

Answer 2

3x+y=12
x-5y=4

vamos isolar a incógnita y
y= 12-3x

1x-5(12-3x)= 4
1x -60+15x=4
1x+15x= 4+60
16x=64
x=4

y=12-3x
y=12-3.4
y= 12-12
y= 0


(4,0)