Please help! There isn't a graph to go with it, this is all I have. The vertices of a triangle are P(1,-3) Q(-2,2) R(-1,-1). Name the vertices of the image reflected across the y-axis.

Question

mathstudent55 · Answer

In a reflection across the y-axis, point (x, y) becomes point (-x, y)

anonymous · Answer

@mathstudent55 I still don't understand how I'd solve this though :/ I've read over the lesson in my book like 3 times and I still can't

anonymous · Answer

Wait I think I figured it out it would be P(-3,1) Q(2,-2) R(-1,-1) right...? @mathstudent55

mathstudent55 · Answer

No.
Just rewrite each ordered pair again, but replace each x-coordinate with the negative of the x-coordinate. That's what I meant above with (x, y) becomes (-x, y)
For example, an ordered pair (5, -2) would become (-5, -2), and (-3, 8) would become (3, 8)

anonymous · Answer

@mathstudent55 so (1,-3) would be (-1,-3) (-2,2) would be the same? and I'm not sure what (-1,-1) would be :/

mathstudent55 · Answer

P(1, -3) becomes P'(-1, -3)
Q(-2, 2) becomes Q'(2, 2)
R(-1,-1) becomes R'(1, -1)