Question

{5x-y=4 2x-y=-5 conta armada

Answer 1

{5x-y=4

{2x-y=-5

2x + 5 = y

y = 2x + 5

5x - y = 4

5x - ( 2x + 5 ) = 4

5x - 2x - 5 = 4

3x = 4 + 5

3x = 9

$x = \frac{9}{3}$

x = 3

y = 2x + 5

y = 2 × ( 3 ) + 5

y = 6 + 5

y = 11