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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=a intersects the graph of the quadratic function f(x)=x*x-6x+8 in exactly one point. What is the value of a?
(A) -3
(B) -1
(C) 1
(D) 3
(E) 4
