exam Maths Puzzle Numerical Ability

the graph of the equation y=x^2+2x-8 intersects where on the x-axis?

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I am having trouble with my college homework sheets. Can someone please help me figure these out. I would really appreciate all the help you can give me. This problem is from homework sheet
16.) 6x-y-5z=27
-8x +2z=-56
4y + z=8 HOW DO YOU GRAPH FOCUS AT (2,3) AND DIRECTRIX X= -1?