00:01
All right, so i need to see if this order triple here is a solution to my equation or my system up here.
00:10
How am i going to figure that out? well, i'm going to plug this order triple into each of these three equations.
00:20
And if they all come out true, then this is a solution.
00:25
If one of them doesn't come out or two of them, then it's not.
00:29
So let's figure out.
00:32
So 6 is my x, right? it's the first one listed.
00:35
Negative 7 is my y and negative 5 is my z value.
00:40
Let's plug it into my first equation up there.
00:43
I have 3x.
00:45
So instead of x, remember i'm plugging in 6.
00:47
Substract 2 instead of y.
00:49
I'm plugging in negative 7.
00:51
Subtract z, which is negative 5.
00:54
Does that become 37? 3 times 6, 18.
00:59
Negative, i'm going to put this together here.
01:03
So negative 2 times negative 7 is positive.
01:07
Negative 14 and positive 14.
01:11
And then a negative times a negative 5.
01:14
It's a positive 5...