2x+2y=30 y-4x=0

Answer 1

Eq 1: 2x + 2y = 30

Eq 2: y - 4x = 0 --> y = 4x Substitute this equation into Eq 1, you get

2x + 2(4x) = 30

2x + 8x = 30

10x = 30

x = 30 / 10 = 3

Substitute x = 3 into Eq 2, y = 4x

y = 4(3) = 12