00:03
When we solve this system for x and y, we're going to end up with our answers having a lot of letters, a, b, and c in them rather than numbers.
00:10
But we'll use all the same ideas that we normally use with numbers.
00:14
So what i'm going to do is multiply the second equation by negative 1.
00:17
I get negative 1 times a x minus cy minus b equals 0.
00:23
And then i'll leave the first equation as it is.
00:26
That way we have opposite coefficients on x.
00:30
And when we add the equations together, the x terms will be eliminated.
00:35
And then we have b -y minus c -y plus c -minus b equals 0.
00:42
So what we want to do is keep the y terms together on one side and take the other terms to the other side...