(3*(x+2y)-y=27 (4*(x+y)-3x=23 (5x-2*(y+4)=0 (6*(2x+3)-y=41 (2x+3*(x+y)=11 (7*(x+3y)-6x=-59

1) 3x+6y-y=27 4x+4y-3x=23 3x+5y=27 x+4y=23 x=23-4y 3(23-4y)+5y=27 69-12y+5y=27 -7y=27-69=-42 y=6 x=23-4*6=-1 2) 5x-2y=8 12x+18-y=41 5x-2y=8 12x-y=23 y=12x-23 5x-2(12x-23)=8 5x-24x+46=8 -19x=8-46=-38 x=2 y=12*2-23=1 3) 2x+3x+3y=11 7x+21y-6x=-59 5x+3y=11 x+21y=-59 x=-59-21y 5(-59-21y)+3y=11 -295-105y+3y=11 -102y=306 y=-3 x=-59-21*(-3)=-59+63=4