the vertices of a triangle are p(-7, -4) Q(-7 -8 and r3, -3. name the vertices of the image reflected across the line y=x?

Answer 1

reflection in y=x takes (x,y) -> (y,x)
so just swap all the pairs.
you seem to have a problem with parentheses.
Also, "naming" the images of P,Q,R makes them P',Q',R'