Question

Quanto é?
H) / 7x + y = 38
\ X - 2y = -16

Answer 1

x = -16 + 2y

7( -16 + 2y) + y = 38

-112 + 14y + y = 38

15y = 38 + 112

15y = 150

y = 150/15

y = 150÷15

y = 10

X - 20 = -16

x = -16 + 20

x = 4.