00:01
All right, so for the electric car, i'll just write an e here, so we have this all organized.
00:08
The cost, c, is going to depend on how many miles we drive, the miles are x.
00:15
And we know that every mile costs four cents.
00:19
So since each mile is four cents, we'll multiply x by 0 .04.
00:26
And that will give us a total amount of dollars that we'll have to pay.
00:29
And remember that when we first start driving, we haven't paid anything.
00:37
So the y intercept or the initial amount is zero, so we can just write plus zero.
00:43
But this isn't necessary to write.
00:46
Likewise, this exact same type of thinking for the car that uses gasoline.
00:52
So c here is going to depend on x once again, the number of miles we drove.
00:59
But this time it's going to cost 12 cents.
01:04
And again, the y intercept is zero, but this time we won't write it...