I'm completely lost with this one....

A company charting its profits notices that the relationship between the number of units sold, x, and the profit, P is linear. If 300 units sold results in $4650 profit and 375 units results in $9000 profit write the equation that models the profit.

What I got was 4350x-1300350

using the y-y1=m(x-x1)

(Nerd)