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You can't. All you can tell is the relationship between 'x' and 'y'.
x = 40 - 0.75y
y = 1/3 of (160 - 4x)
There are an infinite number of pairs of numbers that 'x' and 'y' can be.
In order to find out a single pair of numbers that 'x' and 'y' must be, you need another equation.
You need the same number of equations as the number of 'unknowns' you're trying to find.
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