Rozwiąż układ równań: x+y=15 17x+20y=210

x+y=15 17x+20y=210 x= 15-y 17(15-y) + 20y= 210 255 - 17y +20y = 210 3y= - 45 |:3 y= -15 x= 15-y x= 15 - (-15) x=30

x+y=15/-y 17x+20y=210 x=15-y 17*(15-y)+20y=210 x=15-y 255-17y+20y=210/-255 x=15-y 3y=-45/:3 x=15-y y=-15 x=15-(-15) y=-15 x=15+15 y=-15 x=30 y=-15

x+y=15/-y 17x+20y=210 x=15-y 17(15-y) + 20y=210 x=15-y 255-17y + 20y = 210 x=15-y 3y=-45/:3 x=15-y y=-15 x=15-(-15) y=-15 x=30 y=-15