00:39
Now we're going to do with r and r equal to c.
00:52
Now we need to replace r and c with their expressions in terms of x.
00:57
So again that's the given information.
01:00
So r is equal to 3 .29 times x.
01:10
And cost is equal to, smiley face, cost is equal to 2 .04 plus 5 ,600.
01:32
And let's fix that four.
01:34
That's a little bit funky.
01:35
I guess we're just going to leave it.
01:39
Never mind.
01:39
So hopefully you can read that's 2 .04x.
01:44
And just erase that little dot there.
01:47
All right.
01:48
So what's the first step in solving? this equation, well, we see we need to find, we need to solve for x, so we have to isolate x.
01:56
The first step i would say would be to move this 2 .04 to left side by subtracting it.
02:05
And hopefully you can recall that it does not like fours.
02:18
What we do to one side of an equation, we must do to both sides.
02:24
Otherwise, we change the value of the equation.
02:29
There we go.
02:30
This is writing a little better now...