00:01
So in this problem, we're starting out with a few decimals that look a little intimidating, but i'll show you a way to get past that.
00:11
So 1 .5x plus 0 .8y equals 2 .3.
00:20
Our second equation is 0 .3x plus minus 0 .2y equal to 0 .1.
00:41
Now when you have decimals like this, i have to have a lot of students just get panicked when they see this.
00:48
Again, you can just multiply, because everything just goes to one decimal place.
00:52
One simple thing would just be to rewrite both equations as if you multiply to everything about 10.
00:58
This makes it look easier, which takes away some of the panic.
01:03
So multiply in by 10, we're going to have 15x plus 8y equals 23.
01:13
Our bottom equation will have 3x minus 2y equals 1.
01:21
Now i want us to use substitution for this.
01:24
I'm looking at, let's do the second equation.
01:30
And i'm going to solve for y.
01:32
Now i'll solve for x...