exam Maths Puzzle Numerical Ability

Please help! I need to solve for x, y, and z. I don't understand how to solve for three variables.

Solve for x, y, z
X + 10Y + Z = 52
5X + Y + 4Z = 15
X + 2y - 3Z = 12

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exam Other Question

A&B working together can finish painting the house in six days. A, working alone, can finish it in five days less than B. How long will it take each of them to finish the work alon Find the area of the triangle
One leg is 7 inches and the hypotenuse is 20 inches and the perimeter is 12 inches.