There is one key difference between ∣x−9∣and∣8x−9∣ - a substitution.. (you could swap out the x's for ys in your first answer if it helps.. for the second part, that is).
There is one key difference between ∣x−9∣and∣8x−9∣ - a substitution.. (you could swap out the x's for ys in your first answer if it helps.. for the second part, that is).