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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer. 

In the xy -plane, the graph of the line with equation y equals a intersects the graph of the quadratic function (f times x) equals x^2 minus (6 times x) plus 8 in exactly one point. What is the value of a?

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If a horizontal line in the xy -plane intersects the graph of a parabola in exactly one point, that point must be the vertex of the parabola.

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