exam Maths Puzzle Numerical Ability

Use the Gauss-Jordan method.
4x - 3y + z + w = 21
-2x - y + 2z + 7w = 2
10x - 5z - 20w = 15

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exam Other Question

What is the radius of the circle circumscribing an isosceles right triangle having an area of 162 square centimeters? Please help me solve this i have no idea what to do: determine the unknown coordinate so that the line containing the points has the given slope: (-3,y) and (2,-2) m= -1