Which is the graph of the function y=-4x?

Place the following steps in order to complete the square and solve the quadratic equation,

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Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.