How do i find the height/altitude of this triangle?

Will give brainliest summations with algebraic expressions image shown

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

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)