Question

Lorraine writes the equation shown.

x² + y - 15 = 0
She wants to describe the equation using the term relation and the term function.

The equation represents,
A relation and a function
A relation but not function
A function but not a relation
Neither a relation nor a function

Answer 1

A function is a relation. But a relation is not necessary to be a function. A relation becomes a function if every input just yields an unique output. In this case, we can rewrite the equation as follows.

`y=-x^2+15`

This equation definitely reflect a relation. In addition, if we plug any x-value in for x, we only get one output for y. So this is also a function.

Thus, the right choice is A.