Go to navigation
It is currently Sun Dec 04, 2016 3:58 am

All times are UTC




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Sun Jan 27, 2013 3:24 pm 
Offline

Joined: Sun Jan 20, 2013 10:22 am
Posts: 73
The question is

Write the new co-ordinates if each of these points is reflected in the y axis.

q1 : (1,1) ____
q2 : (2,1) ____
q3 : (0,3) ____
q4 : (3,2) ____
q5 : (1,0) ____

Thanks for your help.


Top
 Profile  
 
PostPosted: Sun Jan 27, 2013 3:30 pm 
Offline

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8112
Have you tried drawing them out ? can be easier to see the coordinates on the actual graph.


Top
 Profile  
 
PostPosted: Sun Jan 27, 2013 3:37 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11934
A maths teacher does not do someone's maths homework!

Draw a diagram and, as it says, use the y axis as the mirror.


Top
 Profile  
 
PostPosted: Sun Jan 27, 2013 3:59 pm 
Offline

Joined: Mon Aug 22, 2011 8:20 pm
Posts: 1706
Location: Warwickshire
In case you just aren't familiar with co-ordinates:
:: the first figure is the position on the X-axis (the horizontal one)
:: the second figure is the position on the Y-axis (the vertical one)
:: they are always presented as (X,Y) - easy to remember if you think that you have to go along to your mountain before you climb up it!

So your first example (1,1) means go along 1, then up 1. If this is "reflected in the Y axis" this means go left (backwards) instead of right (forwards) (or vice versa if your original co-ordinate was a negative). So go left 1, then up 1 - i.e (-1,1). The others will follow the same pattern.

"Reflected in the X axis" would mean that the second co-ordinate would be the negative of the orginal.

It gets a little more complicated when the reflection is in a line other than an axis.


Top
 Profile  
 
PostPosted: Sun Jan 27, 2013 6:53 pm 
Offline

Joined: Sun Sep 09, 2012 6:32 pm
Posts: 290
No it wouldn't. Try it with a mirror and have a look.

If you put the mirror on the y axis, it is the x coordinate that changes. I don't want to tread on toes and do it for you, but I don't want you to get it wrong. Try it on a piece of paper and it should be much easier to picture.

_________________
The more that you read, the more things you will know.
The more that you learn, the more places you'll go.
Dr Seuss


Top
 Profile  
 
PostPosted: Sun Jan 27, 2013 7:01 pm 
Offline

Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3810
Location: Chelmsford and pleased
Reflected in the y axis means the vertical axis (put a mirror along the y axis and have a look) so the y coordinate will stay the same and the x coordinate will change.

Reflected in the x axis means the horizontal axis so the x coordinate will stay the same and the y coordinate will change.

This is true for all horizontal and vertical lines, not just the axes.


Top
 Profile  
 
PostPosted: Sun Jan 27, 2013 7:07 pm 
Offline

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11934
Moved - that's not exactly correct as some points will remain where they are under a reflection ....


Top
 Profile  
 
PostPosted: Thu Jan 31, 2013 7:43 pm 
Offline

Joined: Sun Jan 20, 2013 10:22 am
Posts: 73
Thanks everyone for your lovely help.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
CALL 020 8204 5060
   
Privacy Policy | Refund Policy | Disclaimer | Copyright © 2004 – 2016