Posted by **Mathsnewbie** on Wednesday, March 23, 2011 at 3:21am.

determine if this is a function?

y= x

show working method please

- Maths -
**Henry**, Thursday, March 24, 2011 at 6:54pm
Graph the Eq and draw a vertical line

through it. The line will intersect the

graph at only one point. Therefore, the Eq is a function; because it passed the vertical line test.

If you graph an X-parabola and perform

the vertical line test, the line will

intersect the graph at 2 points. There-

fore, the X-parabola is not a function;

because it does not pass the vertical

line test.

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