Question

Draw a graph of the equation x²+y²-2xy=0

Answer 1

$x {}^{2} + y {}^{2} - 2xy = 0 \\ therefore \: \\ (x - y) {}^{2} = 0$
root both sides
therefore
x - y =0
hence x = y
put values in this equation for x to get y and plot on graph using the coordinates.