book Maths Puzzle Numerical Ability

How do you solve for linear equations with this problem: 4x+3y=5
-3x-6y=0

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book Other Question

Suppose W varies directly as x and y and inversely as Z, and W=48 when X=2, Y=8 and Z=12. Find W when X=12, Y=6 and Z=24. If there is a cylinder 60ft high and 20ft in diameter and it is two thirds full how much water is in it use 3.14 for pi. thanks i need it !