Thread:HMcCoy/@comment-28838092-20140825225626/@comment-24808864-20140826000248

On the second problem (4a:) the domain and range are quite large!

If you want to see if a certain x value is allowed, you should choose an x value, draw a vertical line, and see if that vertical line intersects your graph.

For example, the point (-5,0) is on the graph of the line, so the number -5 is in the domain of the relation.

Also the point (0,-3) is on the graph of the line, so the number 0 is in the domain of the relation.

In fact, since the line extends infinitely far left and right, every x-value can be used for some point of the line. Therefore the domain would be "all real numbers."

The argument for range, is to do the same thing for the y-coordinates. What do you think? Which y-coordinates have points that are on the graph of the line? Why?