Posted by **mikil** on Monday, August 12, 2013 at 11:23pm.

Reflect the point (-3,1) over the y axis. What is the new coordinate. Give explanation.

- Math -
**Jai**, Monday, August 12, 2013 at 11:35pm
First, try plotting (-3,1) on a graphing paper. You'll see it's in the 2nd Quadrant. When you reflect it on the y-axis, 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~ :)

- Math -
**Steve**, Tuesday, August 13, 2013 at 12:05am
excuse me? reflection in the y-axis changes only the x-coordinate. Using the y-axis as an "axle" rotate the point 1/2 turn, to wind up at (3,1)

(x,y) -> (-x,y)

- Math -
**Jai**, Tuesday, August 13, 2013 at 12:08am
OMG I'm sorry I'm thinking about x-axis!

Sorry about that.

- Math -
**Steve**, Tuesday, August 13, 2013 at 12:10am
It's easy to mis-read problems. been there, done that. One reason why it's good that we check each other's work.

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