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Answer:
Step-by-step explanation:
We can add 9 to both sides of the equation to get .
We can divide both sides of the equation by 21 to get .
We take the square root of both sides of the equation to get .
However, that isn't in the form we need.
We know that
so the answer is really and we're done!
(a) The relation is a function because each value of x maps onto only one value of y.
(b) Domain is , range is
.