exam Maths Puzzle Numerical Ability

Find the solution to the following system of equations using the Gauss-Jordan method.

3x+y=1
x-y=1

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exam Other Question

Six students each try to guess the number of pennies in a jar. The six guesses are 52, 59, 62, 65, 49, and 42. One guess is 12 away, and the other guesses are 1, 4, 6, 9, and 11 away. How many pennies are in the jar? Determine whether it is rational or irrational:

sqrt -
This problem has no numbers so I believe it is a irrational root, correct? Thank you