Question

4x - y = 3y + 7

Answer 1

Answer:

1/2 or .5

Step-by-step explanation:

solve for x in the bottom equation

x = 4 - 8y

substitute the equation for x back into the top equation

4(4-  8y) - y = 3y + 7

solve for y

36y = 9

y = 1/4

substitute y back into the equation solving x

x = 4 - 8(1/4)

solve for x

x = 4 - 2

x = 2

xy = 1/4 * 2

xy = 1/2