SOLUTION: The out put of a function is 7 more than 3 times the input. Find the input when the output is -8

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Question 1001986: The out put of a function is 7 more than 3 times the input. Find the input when the output is -8
Answer by MathLover1(20850) About Me  (Show Source):
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The out put (y) of a function is 7 more than 3 times the input (x).
y=3x%2B7
Find the input when the output is y=-8:
-8=3x%2B7
-8-7=3x
-15=3x
-15%2F3=x
-5=x
the input is -5