a) -(x+1)-2(y+1)=-5 3x+5y=7 -x-1-2y-2=-5 3x+5y=7 -x-3-2y=-5 3x+5y=7 -x-2y=-2/*3 3x+5y=7 -3x-6y=-6 3x+5y=7 -3x-6y+3x+5y=-6+7 -y=1/*(-1) y=-1 3x+5*(-1)=7 3x-5=7 3x=12/:3 x=4 x=4 y=-1 b) 2(x-3)+(y-5)=-4 x+2y=14 2x-6+y-5=-4 x+2y=14 2x-11+y=-4 x+2y=14 2x+y=7/*(-2) x+2y=14 -4x-2y=-14 x+2y=14 -4x-2y+x+2y=-14+14 -3x=0/:(-3) x=0 0+2y=14 2y=14/:2 y=7 x=0 y=7
1) -(x+1)-2(y+1)=-5 3x+5y=7 -x-1-2y-2=-5 3x+5y=7 -x-2y=-2 /x3 3x+5y=7 -3x-6y=-6 3x+5y=7 ___________ + = -y= 1 y= -1 3x+5y=7 3x=7 - (5x-1) 3x = 7 + 5 3x = 12 x = 4 x = 4 y= -1 2) 2(x-3)+(y-5)=-4 x+2y=14 2x-6+y-5=-4 x+2y=14 2x-11+y=-4 x+2y=14 2x+y = 7 x+2y=14 /x(-2) 2x+y=7 -2x-4y=-28 +__________ = -3y = -21 y = 7 2x + 7 = 7 2x = 0 x = 0 x = 0 y = 7
a) -(x+1)-2(y+1) =-5 3x+5y=7 -x -1 - 2y - 2 = -5 3x + 5y = 7 - x -2y = -2 /*5 3x + 5y = 7 /*2 -5x - 10y = -10 6x + 10y = 14 .................. x = 4 3x + 5y = 7 3 *4 + 5y = 7 5y = 7 - 12 y = -1 b) 2(x-3)+(y-5)=-4 x+2y=14 2x - 6 + y - 5 = -4 x + 2y = 14 2x + y = 7 x + 2y = 14 /* (-2) 2x + y = 7 -2x -4y = -28 ................... -3y = -21 /:(-3) y = 7 2x + y = 7 2x + 7= 7 2x = 0 x = 0
