P=12.4-4Qd How do you get P into this equation to make it Qd=12.4-4P?
Hummmmm, I don't think you want to do that!
P=12.4-4Qd could be rearranged, using simple algebra, as Qd=-(P/4) + (12.4/4)
P=12.4-4Qd could be rearranged, using simple algebra, as Qd=-(P/4) + (12.4/4)