Question

Can someone pleasee help or explain to me how u do this? I don’t really Understand ?

Answer 1

Reflection in the line y = x :
- meaning your line goes through quad 1 and quad 3

The rule for a reflection in the line y = x is :
( x, y ) —> ( y, x )
which in your case is:
( 4, 2 ) —> ( 2, 4 )

So the answer is (2,4)