Question

x+2y=7
4x-y=10 ajudem

Answer 1

x + 2y = 7
x = 7 - 2y
x = 7 - 2 * 2
x = 7 - 4
x = 3


4x - y = 10
4 * (7 - 2y) - y = 10
28 - 8y - y = 10
-9y = -18 .(-1)
9y = 18
y = 2