Which pair of ratios forms a proportion

Which expression is not a polynomial?

Consider the following estimates from the early 2010s of shares of income to each group. country poorest 40% next 30% richest 30% bolivia 10 25 65 chile 10 20 70 uruguay 20 30 50 1.) using the 4-point curved line drawing tool, plot the lorenz curve for bolivia. properly label your curve. 2.) using the 4-point curved line drawing tool, plot the lorenz curve for uruguay. properly label your curve.

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10