00:01
All right, so here we're told to make a model, create an equation, figuring that, ok, if gas costs $3 .50 a gallon, how can we model the cost, c, of buying x gallons? so we know that if it costs $3 .50 per gallon, and that's for x gallons of gas, then our cost model, c, we can call it c of x, would be equal to 3 .50 times x.
00:29
In this case, this is in y equals mx plus b form, where our m, our slope, is 3 .5.
00:36
And our b is 0, because if we don't buy any gas, then our cost is 0...