Expert: Josh - 9/7/2006

Question
What is true about points with a x-value of 0? & What is true about points witha y-value of 0?

Answer
A point may be represented by (x,y) on an x-y plane....[#1]

Points with a x-value of zero are given by (0,y). We have substituted x=0 in [#1].

So, the y-value is allowed to vary, while the x-value is fixed at x=0. As a result, the points lie on a vertical line. In fact, this line coincides with the y-axis.

Would you like to have a go at the second part yourself, following the same ideas?

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Okay, let's check your reasoning against mine.

Here, we fix y at y=0. Thus, points are represented by (x,0). This time, x value may vary, while y value is fixed. The points must lie on a horizontal line which coincides with the x-axis.