Which graph shows a system of equations with the solution (5,-3)?

If eh = hg and hg=16, find the diameter of k

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?