Suppose a, b, and x are n times nn×n matrices with a, x, and a - ax invertible, and suppose that (a - ax)^-1 = x^-1 b. complete parts (a) and (b) below. a) explain why b is invertible. b) solve equation (3) for x. if matrix needs to be inverted, explain why that matrix is invertible.

Question 3 (essay worth 10 points) (03.06 mc) part a: max rented a motorbike at $465 for 5 days. if he rents the same motorbike for a week, he has to pay a total rent of $625. write an equation in the standard form to represent the total rent (y) that max has to pay for renting the motorbike for x days. (4 points) part b: write the equation obtained in part a using function notation. (2 points) part c: describe the steps to graph the equation obtained above on the coordinate axes. mention the labels on the axes and the intervals. (4 points)