exam Maths Puzzle Numerical Ability

Use the Gauss-Jordan method to solve each system of equations.
4x-3y+z+w=21
-2x-y+2z+7w=2
10x-0+5z-20w=15

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exam Other Question

Given P(A),find P (not A)

Events A and B are dependent.P(A) = 5/12 and P(B given A) = 6/11. Find (A and B)

Thank You for the straightfoward and correct answers you all send me. The point (3,2) lies on a line with slope -1/3.

Graph this line by finding anoher point that lies on the line.