After you add 10 to both sides you have,Originally Posted by Euclid Alexandria
Now multiply by negative one to get,
45 = -10 - y
Here is how I tried to solve the problem. Judging from the section of the book I'm working in, there should have been some multiplication involved.
45 + 10 = -10 - y + 10 (Add 10 to both sides.)
55 = y
By checking the original equation, I came up with a false statement.
45 = -10 - 55
45 = -65