00:01
We're given the following system of equations, and we need to solve it by substitution.
00:05
So the second equation is already solved for y.
00:07
So the 2x minus 12 is going to replace the y in the first equation.
00:12
So when i rewrite the first equation, it's going to be 3x plus 2.
00:16
Instead of y, i'm going to replace it with 2x minus 12 equals negative 3.
00:25
I look at the equation.
00:26
I only have x.
00:27
So that means the substitution is done okay.
00:30
I go ahead and distribute.
00:31
So i get 3x plus 4x minus 24 is equal to negative 3.
00:37
I'm going to combine like terms, 3x and 4x, give me 7x minus 24 is equal to negative 3.
00:44
I'm going to move the 24 over by adding 24 to both sides.
00:47
So you're left with 7x is equal to 21...