4)2x+y=2 y=0 2x+0=2 y=0 x=1 y=0 5)-2x+3y=0 x=3 -2(3)+3y=0 x=3 3y=6 x=3 y=2 x=3 6)3x-2y=4 y=1 3x-2=4 y=1 3x=6 y=1 x=2 y=1 7)3x+y=10 y=2x x=2 y=4 8)x+2y=14 y=3x 7x=14 y=3x x=2 y=6 9(4x-y=9 y=x 3y=9 y=x y=3 x=3 10)3x+y=1 y=-2x x=1 y=-2 11)4x+2y=6 y=-x 2x=6 y=-x x=3 y=-3 14)2x-4y=18 y=5x 2x-20x=18 y=5x x=1 y=5 15)3x+6y=12 x=-3y 3y=12 x=-3y y=4 x=-12 16)x+y=3 x-y=1 1+y+y=3 x=1+y y=2 x=3 17)2x+y=1 x-y=2 2(2+y)+y=1 x=2+y y=1 x=3 18)-3x+2y=1 x-y=3 -3x+2y=1 x=3+y -9-3y+2y=1 x=3+y y=-8 x=-5 19)x+y=9 x-y=-1 -1+y+y=9 x=-1+y y=5 x=4 20)x+y=8 x-y=0 y=4 x=4 21)y-x=-7 x+y=13 y-x=-7 x=13-y y-13+y=-7 x=13-y 2y=6 x=13-y y=3 x=10 22)2x+y=3 x+y=1 2x+y=3 x=1-y 2(1-y)+y=3 x=1-y 2-2y+y=3 x=1-y -y=1 /- x=2 y=-1 x=2 23)4x-y=3 x+y=7 4x-y=3 x=7-y 4(7-y)-y=3 x=7-y 28-4y-y=3 x=7-y -5y=-25 x=7-y y=5 x=2 24)x-5y=1 x-2y=4 x-5y=1 x=4+2y 4+2y-5y=1 x=4+2y -3y=-3 x=4+2y y=1 x=6 27)5x-y=21 y-2x=-3 5x-y=21 y=-3+2x 5x+3-2x=21 y=-3x+2x 3x=18 y=-3x+2 x=6 y=-16 29)2x-2y=10 x+2y=20 2x-2y=10 x=20-2y 2(20-2y)-2y=10 x=20-2y 40-4y-2y=10 x=20-2y -6y=-30 x=20-2y y=5 x=10 30)x=37-4y 2x+5y=53 2(37-4y)+5y=53 x=37-4y 74-8y+5y=53 x=37-4y -3y=-21 x=37-4y y=7 x=9
