book Maths Puzzle Numerical Ability

if line b has a slope of -5/3, then what is the slope of a line parallel to b?
i got -5/3
is that right?
thanks for the help!

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book Other Question

could someone please help me out! i need to translate a problem into a mathematical expression translate "nine less than the total of five and a number" thanks for your help!!!!!! Maggie and esther had some rare coins of 3:5. Esther sold 25% of her cOins and had 225 coins left. how many coins must MAGGIE buy to have the smae number of coins as Esther?