Answer:
3x + 3y = x+ 7y is the equation and solutions are in bold below
subtract 3y from both sides
3x= x + 4y
subtract x from both sides
2x=4y
divide both sides by 2
x = 2y
Now we solve for y
3x + 3y = x+ 7y
2x=4y
0.5x = y
y = 0.5x or 1/2x
Explanation: