00:01
This problem wants us to use the substitution or elimination method to solve the system.
00:04
And i'm going to go with elimination here, and i'm going to focus on trying to eliminate the y values, because we're somewhat close to elimination being set up already, because we have a negative 8y, and we have almost a positive 8y, but we have a plus 8 .9th y.
00:20
But we can get rid of that 9 denominator by multiplying the entire top equation by 9, and that will give us a new equation that will help us to solve the system.
00:30
9 times negative 1 5th x will be negative 9 5th x.
00:34
And then we have 9 times a positive 8 nights, which would be 72 nights, but simplified would get us back to 8 nights.
00:40
So plus 8, or excuse me, plus 8 y.
00:42
So plus 8 y there after the 72 nints, simplified 8 .y.
00:46
And then 9 times negative 1 9ths will give us negative 9 9ths, which is negative 1.
00:51
So we do have our y value set up to eliminate, but what we're going to see when we go to use elimination is something that can look a little strange...