Algebra-1

To determine if a relation is a function, each input (x-value) must correspond to exactly one output (y-value). In this case:

The equation x=6.978 means that for every y-value, there is only one specific x-value, which is 6.978.

This creates a vertical line on the coordinate plane passing through (6.978,y) for any y-value. The vertical line test tel...