Question 1064701
Point {{{P(x,y)}}} reflected about the line {{{y=x}}} becomes point {{{Q(y,x)}}} ,
and {{{Q}}} reflected about the line {{{y=x}}} becomes {{{P}}} .
The x- and y-coordinates swap places.
S8, the vertices of triangle {{{ABC}}} are points
{{{A(1,-1)}}} , {{{B(-1,-2)}}} , and {{{C(0,-1)}}} .
{{{drawing(300,300,-3,2,-3,2,
grid(1),green(line(-3,-3,3,3)),
red(line(-1,1,-2,-1)),red(line(-2,-1,-1,0)),
red(line(-1,1,-1,0)),line(1,-1,-1,-2),
line(-1,-2,0,-1),line(1,-1,0,-1),
locate(1.05,-1,A),locate(-0.95,-2,B),locate(0.05,-0.75,C),
locate(-0.95,1.25,"A '"),locate(-2.25,-0.75,"B '"),
locate(-0.95,0.25,"C '")
)}}}