SOLUTION: Is this a function? x + y = 12 a. yes b. no c. It depends d. None of the above

Question 141884: Is this a function?
x + y = 12
a. yes
b. no
c. It depends
d. None of the above

Answer by nabla(475) (Show Source): You can put this solution on YOUR website!
Recall that a function assigns a y-value for every x-value. However, x-values can not be paired with multiple y values. That is the tool we utilize when using the vertical line test. Can you draw a vertical line through any/every place on the graph and not have it cross more than once?
In any case, your equation here can be rewritten as a function y(x):
y=12-x
y(x)=12-x
It is clearly a function.
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