I was able to prove that || . ||A is a norm, but I need help solving the second part of the question

I was able to prove that || . ||A is a norm, but I need help solving the second part of the question. That is, I need help plotting the unit ball described by || . ||A[3 pt ) Weighted norms .For any vector norm . and nonsingular matrix $1, define a weighted normllulla = 11 Hull VUE {`Prove that \ . II, is in fact a norm . Choose a matrix AE #* _ and plot the unit ball describedby 11 . 1/4. i.e., plot the points ( I, W ) E B = [VEK’ such that |ullA = 1) .