Book Maths Puzzle Algebra

how do you convert y=-1/2x+5 to standard form?

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Book Other Question

Find the geometric mean of the two numbers 5 and 15. Leave answer in simplest radical form. Please explain how the simplifying works to get from:
D/3 = 4 + D/9,
TO:
3D = 36 + D
Also, where could I find more about this type of problem?