Question 1002185
Note: to say "x squared" we type "x^2"



x*y = 3 ... start with the second equation



x*(x-2) = 3 ... replace every y with (x-2). This is valid because the first equation is y = x-2



x*x + x*(-2) = 3 ... distribute



x^2 - 2x = 3 ... multiply



x^2 - 2x - 3 = 0 ... subtract 3 from both sides