Question

Help please?


Triangle ABC is reflected across the line y = x. What are the coordinates of the vertex B' of the resulting triangle A'B'C'?

2, -5)
(-2, 5)
(5, -2)
(-5, -2)

Answer 1

Would it be (5,-2) ?

Answer 2

no. just get a ruler and measure it up

Answer 3

when a point \P((a,b)\) is reflected across the line \(y=x\), the coordinate of its reflection is \((b,a)\); that is, you swap the \(x\)- and \(y\)-coordinates of the point.