book Maths Puzzle Numerical Ability

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-6x - 5y = 20
-y = 6x + 4

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book Other Question

Identify the shape of the graph, transform it into standard form, and sketch the graph.
x^2 - 4y^2 + 4x - 24y - 36 = 0 x-1 divided by x squared + x-12 plus x-4 divided by x squared -9