Question

X + y=7
__
2
2y-x=10

Answer 1

Vamos là.

sistema

(x + y)/2 = 7

2y - x = 10

x + y = 14

-x + 2y = 10

adição

3y = 24

y = 8

x + 8 = 14

x = 6

S = (6, 8)

Answer 2

$x + y = \frac{7}{2} \\ \underline{ - x + 2y = 10 } \\ 0 + 3y = \frac{27}{2} \implies y = \frac{9}{2} \\ \\ \\ x + \frac{9}{2} = \frac{7}{2} \implies x = \frac{7}{2} - \frac{9}{2} = - 1$