exam Maths Puzzle Numerical Ability

How do I solve this system of equation?

i x + y + z = 5
ii 2x − y + z = −2
iii 2x + y + 3z = 6

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exam Other Question

Please help with the dice problem:

a) how many outcomes are there if four distinct dice are rolled? (e.g. 2,3,5,6 on the 1st, 2nd, 3rd and 4th die and 6,5,3,2 on the 1st, 2nd, 3 How do i calculate the value of the discriminant of x^2+x+3=0