00:01
Hello, so to solve here by substitution, we're looking at our first equation.
00:05
We could solve for one of the variables.
00:09
Let's see if we solve for x, while we get 2x is going to be equal to negative 4y minus 3 .8, dividing through by 2.
00:20
The x is going to be equal to, while negative 4y minus 3 .8, all divided by 2.
00:30
So therefore x is equal to negative 4 over 2 is just negative 2 y.
00:35
And then we get minus 3 .8 over 2.
00:42
Okay, so that's equal.
00:44
There's x.
00:44
If you're substituted that in to the other equations, 9 times x, so 9 times negative 2y, minus 3 .8 over 2 is got a minus 5y is equal to.
01:00
To one three.
01:02
So what we get here? we get nine times negative two y is negative y.
01:08
And then this gives us, well, negative nine times three point eight over two...