SOLUTION: Determine whether the equation defines y as a function of x. x+y=9

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Question 975364: Determine whether the equation defines y as a function of x.
x+y=9

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
rewrite as y=-x+9
y is a function of x. For every x, there may be only one value of y.
If you draw a vertical line through the graph, it touches the graph in only one point.
graph%28300%2C300%2C-10%2C10%2C-10%2C10%2C-x%2B9%29