If (x, y) is a solution to the system of equations, what is the value of y?

x + 1/8y = 20

x + 1/4y = 4

X+1/8y=20

X+2/8y=4 (converted the fraction so also has denominator 8)

Subtract the first from the second equation

1/8y=-16

Y=-128

Plug in to get x and check it.

X+1/8 (-128) = 20

X-16=20

X=36

Check with second equation.

X+1/4 (-128) = 4

X-32=4

X=36

So y = - 128