Quote by matt grime
Why is it not what you're looking for? It is exactly what you asked for. The difference is that in your graphic you've plotted P on the vertical (y) axis, and V on the x axis, so the equation you've got is from solving P=uV+w, which can be gotten by simple rearrangement of the equation you worked out above.

oh ok so i was wrong then, with the variables. thanks for the help.