How would I "solve by addition"? I'm not sure how to solve this.
$3x + 2y = 11$ and under that $3x – 2y = 13$
My notes that go along with it are:
In the addition method, you want to add the equations in such way so that one of the variables (letters) drops out. $x$ and $y$ are on the same side. So how do we solve? The number in front of one of the letters must be the same number and opposite in sign.
But I am completely lost. From the start, how do I solve this by addition method?