# Find maximum point of curve graph

• Sep 29th 2011, 09:02 AM
FailInMaths
Find maximum point of curve graph
Hi,

when finding maximum point of graph, where do I look at? The y axis or the x axis?
Also, the answer should be "x=7" (for example), am I right?

Thank you
• Sep 29th 2011, 09:08 AM
Siron
Re: Find maximum point of curve graph
A point has always 2 coordinates if you're working in a plane, so a maximum $M$ could be for example $M(7,4)$.
• Sep 29th 2011, 09:11 AM
FailInMaths
Re: Find maximum point of curve graph
Quote:

Originally Posted by Siron
A point has always 2 coordinates if you're working in a plane, so a maximum $M$ could be for example $M(7,4)$.

Hmm, but the question didn't state for the coordinates of maximum point of the curve, so I thought the answer would be different. Am I wrong?
• Sep 29th 2011, 09:24 AM
Siron
Re: Find maximum point of curve graph
But for example $x=7$ can't represent a point, it represents a line (parallel to the y-axis).
• Sep 29th 2011, 09:27 AM
FailInMaths
Re: Find maximum point of curve graph
Quote:

Originally Posted by Siron
But for example $x=7$ can't represent a point, it represents a line (parallel to the y-axis).

Yea, I will write the answer in coordinates then

Thanks a lot

Btw, how do I find the equation of line of symmetry if the line (line of symmetry) itself is in the y axis ? Which number do I take?
• Sep 29th 2011, 09:31 AM
Siron
Re: Find maximum point of curve graph
Do you mean the $y-$axis itself? It's just $x=0$.
• Sep 29th 2011, 09:39 AM
FailInMaths
Re: Find maximum point of curve graph
Quote:

Originally Posted by Siron
Do you mean the $y-$axis itself? It's just $x=0$.

Yes. Thanks for the quick reply =)
• Sep 29th 2011, 09:49 AM
Siron
Re: Find maximum point of curve graph
You're welcome! :)