00:01
Okay, i'm going to solve this equation using substitution.
00:06
So notice my second equation has x, y, and z.
00:12
So that's a lot of variables.
00:14
So i'm needing to substitute two of those variables so that i'm left with just one variable and i can solve.
00:23
Notice x and y in equation 1 and 2 are really easy to solve.
00:28
And that means moving z to the other side, z on both of them.
00:35
So that is what we want.
00:38
So i'm going to take this first equation, and i'm going to move 6z to the other side.
00:48
I'm going to eliminate it on the left side by doing the inverse subtraction, right? that's equal to zero.
00:56
And i can't combine these because they're not common or liked terms.
01:03
One has a variable, one doesn't.
01:05
So i'm just going to leave it like that.
01:08
I'm going to do the same thing with this third equation, except this time i'm going to move over the 4z by subtracting 4z on both sides.
01:21
Notice i don't line those up on the right side because they are not alike.
01:27
So i can't combine them.
01:28
I'm going to keep them separate.
01:31
Okay, so now we can go back to our second...