SOLUTION: Please help me determine whether the equation defines y as a function of x: 3x+7y=21

Question 987834: Please help me determine whether the equation defines y as a function of x: 3x+7y=21
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

A function is a relation (so, it is the set of ordered pairs) that does not contain two pairs with the same first component.

defines a function since we can easily find the output when the input, , is given.
If , then => for example.
Or, if , then =>.
So every has a corresponding value.

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