Encontrar la medida del dos ángulos complementarios del uno mide 4/5 del otro

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.

Can someone me do math because i am having a breakdown rn because i don’t get it

How do you solving the solution of each system using elimination?