You know this when the two values (x and y) are inversely proportional to each other by their product being constant (always remaining the same). This means when x increases y will decrease.
Hope this helped :)
Answer:
80x-50y=911
Step-by-step explanation:
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![\frac{1}{5}x - \frac{2}{3} y = 30 \\](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B5%7Dx%20-%20%20%5Cfrac%7B2%7D%7B3%7D%20y%20%3D%2030%20%20%5C%5C%20)
Putting the value of Y = 15
![\frac{1}{5} x - \frac{2}{3} \times 15 = 30 \\ \frac{1}{5} x = 30 + 10 \\ \frac{1}{5} x = 40 \\ x = 5 \times 40 \\ x = 200](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B5%7D%20x%20-%20%20%5Cfrac%7B2%7D%7B3%7D%20%20%5Ctimes%2015%20%3D%2030%20%20%5C%5C%20%20%20%5Cfrac%7B1%7D%7B5%7D%20x%20%3D%2030%20%20%2B%20%2010%20%5C%5C%20%20%5Cfrac%7B1%7D%7B5%7D%20x%20%3D%2040%20%5C%5C%20x%20%3D%205%20%5Ctimes%2040%20%5C%5C%20%20x%20%3D%20200)
So, X = 200
6m+23
You have to use distributive property, so 15x2=30 and 2x3m= 6m. You then subtract 30 from 7 and get 23.