Given that a is a parameter and a ‡ -1, a linear function passes through two points P = (a +5,-2) and Q = (4,2a). Answer the following questions about linear functions. (a) What is the slope of this linear function? (b) Derive the straight line equation for this function. (c) If the point Q = (xq, 4), what is the x-coordinate (x) of the point Q?

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