00:01
So we have these three equations here.
00:02
I want to cancel out a variable.
00:04
Are there any i can add or subtract to cancel a variable? well, actually, all my y terms have a coefficient of two, so i can just do one minus the second equation.
00:15
This will give me negative 2x.
00:17
The y is cancel, z minus negative z plus 2z.
00:21
0 minus 4 is negative 4.
00:24
Divide by 2 to all three terms.
00:26
Negative x plus z equals negative two.
00:32
I could also do the second equation minus the third equation to cancel off the ys again.
00:39
3 minus negative x is going to be 4x.
00:44
Y is cancel, negative z minus 3 z is negative 4 z equals 4 minus negative 4 is 8.
00:50
Divide by 2 to all three terms...