For #2 my book says the answer is -1. why and how?? 1.) 5x + 5y 5x - 5y 2.) 5x - 5y 5y - 5x
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Originally Posted by benjixbunn For #2 my book says the answer is -1. why and how?? 2.) 5x - 5y 5y - 5x Because $\displaystyle (y-x)=-(x-y)$.
Originally Posted by benjixbunn For #2 my book says the answer is -1. why and how?? 1.) 5x + 5y 5x - 5y 2.) 5x - 5y 5y - 5x $\displaystyle \displaystyle{\frac{5x-5y}{5y-5x}=\frac{-5(y-x)}{5(y-x)}=-1$ Tonio
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