SOLUTION: How many liters of water containing 4 grams of salt per liter must be combined with x liters of water which contains y grams [y is less than 2] of salt per liter to yield a solutio

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Question 271615: How many liters of water containing 4 grams of salt per liter must be combined with x liters of water which contains y grams [y is less than 2] of salt per liter to yield a solution with 2 grams of salt per liter.
need equation in x and y
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How many liters of water containing 4 grams of salt per liter must be combined with x liters of water which contains y grams [y is less than 2] of salt per liter to yield a solution with 2 grams of salt per liter.
need equation in x and y

4gram solution------------------- y grams solution---------------- 2 gram mix
-------a ------------------------------ x liters-------------------- a+x

Let the quantity of 4 gram solution added be a
4a + xy = 2(a+x)
4a= 2(a+x) -xy
a= 2(a+x) -xy / 2