Question

no sistema:
{5x+2y=2
{6x+y=8

o quociente y:x é igual a?
a) -4
b) -2
c) 2
d) -8

Answer 1

{5x+2y=2   (I)
{6x+y=8     (II)

(II)
6x + y = 8
y = 8 - 6x

(I)
5x+2y=2
5x + 2 (8-6x) = 2
5x + 16 - 12x = 2
-7x = 2 - 16
- 7x = -14
 x = -14 / -7
x = 2