00:01
So in this question, we want to find a linear function of the form p of n equals mn plus b, modeling the situation that 1 ,000 t -shirts can be sold if our price is $30 ,000 and 3 ,000 t -shirts can be sold, if the price per shirt is $20.
00:35
So writing this a bit more mathematically, we're saying the price that can be charged, if the number of t -shirts is 1 ,000 is 30, while the price that can be charged, if the number of t -shirts is 3 ,000, that's 20.
00:56
And so what i have here are essentially two points.
01:00
I've got the point 1 ,000, 30, and i have the point 3 ,000, comma 20.
01:11
Now, what can i do? i want to find the slope of this line segment.
01:17
How do i find slope? well, i do y2 minus y1 over x2 minus x1.
01:27
So in this case, i'm getting 20 minus 30 over 3%...