00:01
All right, this is a nice system of equations problem.
00:03
It tells you two mechanics worked on a car.
00:06
The first mechanic charged $45 an hour.
00:09
So we're gonna say, we're gonna let x equal the first mechanics number of hours.
00:16
And we're gonna let y equal number of hours, the second mechanic work.
00:30
And it tells us the mechanics work for a combined total of 20 hours.
00:35
So the first mechanic worked, the second mechanic worked, and they can't exceed 20.
00:41
They work for 20 hours total.
00:43
Then it says together they charged a total of $1 ,500.
00:47
Okay, well, the first guy, the first mechanic was $45 an hour.
00:52
The second mechanic is $85 an hour.
00:56
And together they combined to charge $1 ,500.
01:01
If you notice the first one kind of talks about, you know, your hours, how many hours you're talking about.
01:07
And the second one's all about money, right? $45, $85, $1 ,500.
01:12
So everything is dollars.
01:14
Now you can do this a couple of different ways.
01:16
You can do a substitution if you want.
01:18
You can do an elimination problem.
01:20
I personally like elimination.
01:23
I'll guess i'll eliminate the x first...