exam Maths Puzzle Numerical Ability

what does the equation y=mx+c mean?

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Hi. I need help answering the following question. Thanks in advance.
Sandy has $3.75 in change. She has three more quarters than dimes but twice as many nickels as quarters. Express as an algebraic equation and simplify. Find the length of a simple iterest loan with P = $640, r = 8.5%, and I = $95.20.