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# Algebra help

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Given p/q = 5/6, q/r = 7/10, and r/s = 9/4, find

(p - q)/(q - r) and (2q - r)/(r + s)

Feb 12, 2022

For example, we know that p/q=5/6. Multiplying boths ides by q, this gives $$p=\frac{5q}{6}$$. Plugging this back into $$\frac{p-q}{q-r}$$ will give $$\frac{\frac{5q}{6}-q}{q-r}.$$