4x + 4y = 1200 2x + 6y = 920

y=80 x=220

4x+4y=1200 2x+6y=920 ||×(-2) 4x+4y=1200 -4x-12y=-1840 //dodajemy stronami -8y=-640 ||÷(-8) y=80 => 2x+480=920, czyli 2x=440, x=220

4x + 4y = 1200 2x + 6y = 920 / * (-2) 4x + 4y = 1200 - 4x -12y = - 1840 - 8y = -640 /:(-8) y = 80 2x + 6y = 920 2x + 6 * 80 = 920 2x = 920 -480 2x = 440 /: 2 x = 220 Odp. X = 220, y = 80