exam Maths Puzzle Numerical Ability

Solve the system of equations: {2x+y-3z=1}
{3x-y+4z=6}
{x+2y-z=9}

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exam Other Question

15. Geometry. A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafte [6+1/2x]=14;-40, how do i decide whether the given number is a solution of the equation?