Question

Qual. E a conta 2×+3y=5
×-4=y=8

Answer 1

x-4y = 8
x = 8+4y

2x+3y = 5
2(8+4y) + 3y = 5
16 + 8y + 3y = 5
16 + 11 y = 5
11y = 5 - 16
11y = -11
y = -11/11
y = -1

x = 8+4y
x = 8+4(-1)
x = 8-4
x = 4