solve the following system of equations algebraically x-2y-z=2 2x+2y-z= -5 -x-y+2z=7
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Originally Posted by waterboy solve the following system of equations algebraically x-2y-z=2 2x+2y-z= -5 -x-y+2z=7 Hi (1) x-2y-z=2 (2) 2x+2y-z= -5 (3) -x-y+2z=7 (1)+(2) 3x-2z =-3 => x=-1+2z/3 (1)+(3) -3y+z=9 => y=-3+z/3 (2) 2(-1+2z/3)+2(-3+z/3)-z=-5 => -8+z=-5 => z=3 x=-1+2z/3=1 y=-3+z/3=-2
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