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?

multiply the equations to eliminate y.
add the equations to eliminate x.
write the points where the graphs of the equations intersect the x-axis.
write the points where the graphs of the equations intersect the y-axis.