Is this proportional - a small pizza costs $9 and each additional topping costs .75

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.

The graph represents this system of equations: 2x + y = 3 2x - 5y = 15 what is the solution to the system of equations represented by the graph? (0, -3) (1,1) (1.5,0) (2.5, -2)