00:01
To solve by substitution, i'm going to set 4 fifths x plus 4 equal to 1 .6x plus 5th.
00:12
And that's because i know this is what y equals.
00:16
So i'm just going to substitute that for y in the first equation.
00:22
Now i'm going to get my x terms on one side.
00:25
So i have 4 fifths x minus 1, 6x plus 4 equal to 5, 6.
00:36
Subtract 4 from both sides.
00:39
So now i have my x terms on one side, my constants on the other.
00:47
But i have fractions, so i'm going to get common denominators.
00:52
I'm going to use 30, 4, 5, and 6.
00:56
So that's 24x minus 5 over 30x.
01:04
On the right side, that's 4 over 1, so i'm just going to use a denominator of 6...