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Question from Isabelle, a student:

Hi! My question is this:

Write the equation of each line described:
A vertical line passing through (10,4)

I would really appreciate your help!
Thanks,
Isabelle

Hi Isabelle,

I drew a diagram and identified a few more points on the line.

line

Every point on the line has its x-coordinate equal to 10. Also every point in the plane with x-coordinate equal to 10 is on the line. Thus the points on the line are completely described by the statement "the x-coordinate is equal to 10". Said as an equation this is

\[x = 10.\]

Penny

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