book Maths Puzzle Numerical Ability

Can't figure out two problems. I am to determine whether the following is consistent, inconsistent, or dependent. If consistent find solution.

First problem:
6x + 4y = 8
9x +

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book Other Question

How are whispering galleries related to conic sections, and could I have an example of a formula that would be used to show a whispering gallery? Factor the quadratic expression completely, and find the roots of the expression.

6x^2 - 42x + 72