book Maths Puzzle Numerical Ability

Identify the shape of the graph, transform it into standard form, and sketch the graph.
x^2 + y^2 - 14x - 6y -42 = 0

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book Other Question

what is 5y-10+-3y, and teh steps to solve it?
thank you
I'm not sure how to divive using long division with polynomials. Could someone help me with this Thanks.
Use long division to reduce (6x^5 - 5x^4 - 6x^3 - 10x^2 + 21x - 9)/(2x - 3