so it's a square which means all of the sides are equal.
that means x+7=3x+1
subtract 1 from both sides
x + 6 = 3x
subtract x from both sides
6 = 2x
divide both sides by 2
3 = x
you can do the same for y
2y - 1 = -3y + 14
add 3y to both sides
5y - 1 = 14
add 1 to both sides
5y = 15
divide both sides by 5
y = 3
