1. 9x+y=33 / - 9x 5x-2y=26 y=33 - 9x 5x - 2y= 26 y=33-9x 5x - 2(33-9x)=26 y=33-9x 5x - 66+ 18x=26 y=33-9x -13x = 26+66 y=33-9x -13x=91 / : (-13) y=33-9x x = 7 y = 33 - 9*7 x=7 y= 33 - 63 x=7 y = -30 x=7 2.
zad.1 9x+y=33 5x-2y=26 y=33-9x 5x-2(33-9x)=26 y=33-9x 5x-66+18x=26 y=33-9x 23x=26+66 /:23 y=33-9x x=4 y=-3 x=4 zad.3 6x+7y=3 2x+5y=1 6x+7y=3 2x=1-5y /:2 6x+7y=3 x=0,5-2,5y 6(0,5-2,5y) +7y=3 x=0,5-2,5y 2-15y+7y=3 x=0,5-2,5y -8y=3-2 /:(-8) x=0,5-2,5y y=-0,125 x=0,5-2,5*(-0,125) y=-0,125 x=O,1875 ? zad.4 2x+2/3y=44 3x-5/6y=33 2x=44-2/3y /:2 3x-5/6y=33 x=22-3y 3(22-3y)-5/6y=33 x=22-3y 66-9y-5/6y=33 x=22-3y -59/6y=33-66 /:-59/6 x=22-3y y=... ?
