Answer:
First, let's simplify both sums by combining like terms:
3x + 5y - 2 + 2x - 3y + 1 = 5x + 2y - 1
4x - 8y + 3 - 5x + 6y + 7 = -x - 2y + 10
Now we can subtract the second sum from the first:
(5x + 2y - 1) - (-x - 2y + 10) = 5x + 2y - 1 + x + 2y - 10
Simplifying this expression, we get: 6x + 4y - 11