You can put this solution on YOUR website! What type of graph do you get when you multiply a linear graph by a linear graph???
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Try it and see, two linear equations graphed
2x + 3
x - 5
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Multiply these two equations
FOIL (2x+3)(x-5) = 2x^2 - 10x + 3x - 15 = 2x^2 - 7x - 15
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Graph this equation on the same system
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You can see it is a parabola and the parabola's x intercepts are the same as the linear equation intercepts