book Maths Puzzle Numerical Ability

Solve the following system by graphing.

3x - 6y = 9

x - 2y = 9

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book Other Question

What is the answer to:

1.5 = -1.2n - 0.9

Thank you for your time in helping me.
Annie How do I do this problem?

10x^2 - 30x + 20 / x^2 - 1