Determine the attributes of the hyperbola represented by this equation: (y-21)^2/20^2-(x+20)^2/21^2=1

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)