exam Maths Puzzle Numerical Ability

Graph the functions L(x)= -3x+17 and Q(x)=2x^2+7x-22 on the same set of axes.

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unsure how to do this problem 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