19.7х-32.3у-3.5(3х-8у)+10х при х=-20,у=-5

Question

19.7х-32.3у-3.5(3х-8у)+10х при х=-20,у=-5

Answer 1

19,7х-32,3у-3,5(3х-8у)+10х=19,7х-32,3у-10,5х+28у+10х=19,2х-4,3у=19,2*(-20)-4,3*(-5)=-384+21,5=-362,5