book Maths Puzzle Numerical Ability

Please help me. I need to know how to compute the intercepts of a quadratic function, and In case of a quadratic function, why are there two x-intercepts and one y-intercept?

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How do I solve

x +3y -6z =7
2x -y +z =1
x +2y + 2z =1

Thanks,
Tijuana This is the problem: Jane has 132 more marbles than Mary has. If their mother gives 25 marbles to each of them, Jane will have 5 times as many marbles as Mary. How