# equation of the line that passes through the point

• June 6th 2007, 06:20 AM
Alexander
equation of the line that passes through the point
which one of the following is the equation of the line that passes through the point (-5,7) and is parallel to the y-axis?

1. y = -5
2. y = 7
3. x = -5
4. x = 7
5. y = 5/7
• June 6th 2007, 07:53 AM
ThePerfectHacker
Quote:

Originally Posted by Alexander
which one of the following is the equation of the line that passes through the point (-5,7) and is parallel to the y-axis?

1. y = -5
2. y = 7
3. x = -5
4. x = 7
5. y = 5/7

Any line which is parallel to y-axis must have the equation $x=k$ for some number $k$.

Since it must pass through $(-5,7)$ we see that $k=-5$ (the x-coordinate).