An unknown number y is 15 more than an unknown number x. The number y is also x less than 8. The equations to find x and y are shown below. y = x + 15 y = −x + 8 Which of the following statements is a correct step to find x and y? (4 points) a Multiply the equations to eliminate y. b Add the equations to eliminate x. c Write the points where the graphs of the equations intersect the x-axis.