exam Maths Puzzle Numerical Ability

what are the greatest common factor (GCF) for the numbers 36 and 84

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Please help me!!!!
My problem says to graph each quadratic equation and state the vertex and intercepts. The equation is y=x^2+4x. I have to have at least 4 intercepts. Thank you so much!!
Solve the system by graphing.
3x – y = 1
3x – y = 2

please help