{3y=6x+12 7x=5y {y=........... ...........=...................

3y=6x+12 | :3 7x=5y y=2x+4 y=7/5x y=2x+4 y=1 2/5x

{3y=6x+12 7x=5y {y=2x+4 7x=5(2x+4) 7x=10x+20 7x-10x=20 -3x20 x=-20/3 y=2(-20/3)+4 y=-40/3+4 y=-13 1/3 +4 y=-9 1/3 =-28/3 x=-20/3 y=-28/3 Spr. 7x=5y 7*(-20/3)=5*(-28/3) -140/3=-140/3 pozdrawiam:)