00:01
So in this question we are asked to solve each system by this substitution method, which means we just have to substitute the value of x or y.
00:14
So we have 3x minus 5, then we have y equals to 3x minus 5.
00:20
We have y here, so we just have to substitute y to this following main equation here, equation 1.
00:28
So 3x minus y, which is 3x minus 5, equals to 5.
01:01
So we can solve this, so 3x minus 3x plus 5 equals to 5.
01:11
So 0 plus 5 equals to 5, which is true.
01:59
So this is an invalid answer because we cannot have, we cannot not have any variables.
02:11
And as you can see here, we do not have any variables x or y.
02:15
So 3x minus y equals to 5, y equals to 3x minus 5 is not valid.
02:24
So as we can see, let's use this first equation here...