Answer:
7x+12 because there is 8x then you subtract 1x which 'll equal 7x and add the 12
A function works like this:
You put any number you want into the input, and
the output depends on the number you put it.
That's why the output is the dependent variable.
Hey!
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Product means multiplication.
-2/7 * -3/6 = -6/42 = -1/7
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Hence, the answer is 
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Hope This Helped! Good Luck!
No, because one x-value corresponds to two different y-values