Which of the following relations is not a function?
a. (-7, 4), (2, 3), (-1, 1), (7, 2)
b. (7, 4), (-1, 2), (2, 1), (-7, 2)
c. (2, 4), (-1, 2), (2, 1), (-7, 2)
d. (-1, 4), (2, 2), (7, 1), (-7, 5)

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Which statement best describes the polynomial

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2