exam Maths Puzzle Numerical Ability

The following matrix is obtained from the augmented matrix of a system of equations.


1 0 3 20
0 1 2 -2
0 0 1 4

What is the solution to the system is?

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exam Other Question

On March 5th, a couple took out a 90-day loan for $450 at 9% interest. On March 29th, they made a partial payment of $150. After making the payment, how much did they still owe? WHY IS VARIABLES USEFUL IN ALGEBRA