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Mathematics > Standard Multiple Choice

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

If the graph of the function f is a line with slope 2, which of the following could be the equation of f?

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The graphs of all the given functions are lines, and the equations are all in the form  y = (m times x) + b. When a linear equation is in the form  y = (m times x) + b, the slope of the graph of the equation is m , the coefficient of x. The graph of the function f is a line with slope 2, so the only choice that could be the equation of f is function f of x = (2 times x) + 4.

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