00:01
Problem gives us a system of equations 2x plus y equals 6 and negative x plus y equals 0.
00:13
It says to solve by using the method of substitution.
00:17
In general, that just means we're going to solve one of these equations for a variable and then plug it back into the other.
00:23
It's just what we do with our first two steps that determines what method we're using.
00:28
So i noticed that this one has some good properties that we can use to solve for a variable, mainly because the y, value has a coefficient of one.
00:37
You really just want to use either equation because the y body has a coefficient of one just because it makes it a little bit easier.
00:44
I'm choosing the second one.
00:46
So if we solve that for y, we're going to add x to both sides.
00:51
X plus zero is just x.
00:53
So we just have that y is going to be equal to x...