5x+2y=20 7x+3y=29

5x+2y=20 7x+3y=29 5x+2y=20/*(-3) 7x+3y=29/*(2) -15x-6y=-60 14x+6y=58 --------------- -x=-2 x=2 5x+2y=20 x=2 5*2+2y=20 x=2 2y=10 x=2 y=5 x=2

5x+2y=20 7x+3y=29 y=20-5x/2 7x+3(20-5x/2)=29 7x+30-7,5x=29 -0,5x=29-30 -0,5x=-1 x=2 y=20-10/2=5

y=20-5x/2 7x+3(20-5x/2)=29 7x+30-7,5x=29 -0,5x=29-30 -0,5x=-1 x=2 y=20-10/2=5 x=2 y=5