Posted by Esther on Tuesday, November 13, 2012 at 2:28pm.
14. Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the xaxis. Please help!! I need answer now!! I have been working on this problme for over an hour cant get it, please help, someone, anyone!!!1

Help, Math 8th grade!!!!!  Steve, Tuesday, November 13, 2012 at 2:30pm
reflecting in the xaxis just changes (x,y) to (x,y). So, just change the sign of all the ycoordinates.

Help, Math 8th grade!!!!!  Esther, Tuesday, November 13, 2012 at 2:30pm
I don't get it ?? :/
Please explain

Help, Math 8th grade!!!!!  Steve, Tuesday, November 13, 2012 at 2:39pm
plot the point (4,2) on graph paper. Now take a piece of string or something and stretch it from (4,0) to (4,2). Anchor the point that is on the xaxis. Now slowly rotate the string over the xaxis, until the end that started at (4,2) lands back on the paper. It will be at (4,2). The ycoordinate has changed signs.
Or, how about this? Reflection in a mirror makes things in front look like they are an equal distance behind. Consider a mirror placed along the xaxis, with the shiny side on the positive yaxis side. The point (4,2) will look like it is behind the mirror, at (4,2).
So, (4,2) > (4,2)
(23,5) > (23,+5)
Just change the signs of the ycoordinates!

Help, Math 8th grade!!!!!  Jessica, Tuesday, November 13, 2012 at 2:41pm
OOHHHH LOL know i feel stupid, thank you sooo much!! Sorry if im by saying i don't get it annoyed you or made you mad in any way :)

Help, Math 8th grade!!!!!  Esther, Tuesday, November 13, 2012 at 2:41pm
Dont know how the name jessica is in the name box lol!!

Help, Math 8th grade!!!!!  Steve, Tuesday, November 13, 2012 at 2:42pm
not mad. Glad it finally clicked, "Jessica" :)

Help, Math 8th grade!!!!!  Esther, Tuesday, November 13, 2012 at 2:55pm
sorry lol, for the name ha ha
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