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
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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 $\displaystyle x=k$ for some number $\displaystyle k$. Since it must pass through $\displaystyle (-5,7)$ we see that $\displaystyle k=-5$ (the x-coordinate).
Last edited by ThePerfectHacker; Jun 6th 2007 at 08:49 AM.
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