Use the Addition Property of Equality to solve the following problem in the form x−p=q . George has a comic book collection. He gave 13 of his comic books to his sister. If he has 42 comic books left in his collection, how many comic books did he have to start with?
Let's assume that George had x comic books to start with.
According to the problem, George gave 13 of his comic books to his sister, so his new count of comic books is x - 13.
We are given that George has 42 comic books left in his collection, so we can set up the equation:
x - 13 = 42
To solve for x, we can add 13 to both sides of the equation:
x - 13 + 13 = 42 + 13
This simplifies to:
x = 55
So, George had 55 comic books to start with.