x+y=2490 13x-17y=0

x+y=2490 13x-17y=0 y = 2490 - x 13x - 17(2490 - x) = 0 y = 2490 - x 13x - 42330 + 17x = 0 y = 2490 - x 30x = 42330 /:30 y = 2490 - x x = 1411 y = 2490 - 1411 x = 1411 y = 1079 x = 1411

x+y=2490 13x-17y=0 x=2490-y 13*(2490-y)-17y=0 x=2490-y 32370-13y-17y=0 x=2490-y -30y=-32370 /:(-30) x=2490-y y=1079 x=2490-1079 y=1079 x=1411 y=1079