Can someone show me the steps to turning this into simplest for of expression

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)

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.