6x+2y=7 9x-4y=0

6x+2y=7 9x-4y=0 12x+4y=14 9x-4y=0 3x=14 x=14/3 6(14/3) + 2y=7 28+2y=7 2y=-21 y=-21/2 x=14/3 y=-21/2

6x+2y=7 9x-4y=0 6x=7-2y 1,5(7-2y)-4y=0 6x=7-2y 10,5-3y-4y=0 6x=7-2y 10,5=7y |:7 y=1,5 x=(7-3):6=4:6=2/3

6x+2y=7/*2 9x-4y=0 12x+4y=14 9x-4y=0 12x+4y+9x-4y=14 21x=14 x=14/21 x=2/3 9x-4y=0 9*2/3-4y=0 6-4y=0 4y=6 y=6/4 y=3/2