Estimate the solution to the following system of equation by graphing

Find the solution of system of equation y= x-4 y=4x+2

How do you do the foil method with polynomials?

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters