Determine which of the following sets of ordered pairs represents a function. A. {(12,−9), (12,4), (12,3), (12,−1)}

B. {(4,−9), (10,12), (4,3), (10,−1)}

C. {(−16,−9), (10,4), (7,3), (−16,−1)}

D. {(−16,−9), (10,−9), (4,−9), (7,−9)}

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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