Math
posted by mikil .
Reflect the point (3,1) over the y axis. What is the new coordinate. Give explanation.

First, try plotting (3,1) on a graphing paper. You'll see it's in the 2nd Quadrant. When you reflect it on the yaxis, the new point will be on the third quadrant (where both x & y coordinates are negative). Therefore the new point is at (3,1).
Hope this helps~ :) 
excuse me? reflection in the yaxis changes only the xcoordinate. Using the yaxis as an "axle" rotate the point 1/2 turn, to wind up at (3,1)
(x,y) > (x,y) 
OMG I'm sorry I'm thinking about xaxis!
Sorry about that. 
It's easy to misread problems. been there, done that. One reason why it's good that we check each other's work.