The required expression for y is 4 -1/3 x
Subject of the formula is a means of expressing a variable in terms of another
Given the equation
1/3 x + y= 4
We are to make y the subject of the formula
Subtract 1/3x from both sides
1/3 x + y -1/3 x = 4 - 1/3 x
y = 4 - 1/3x
Hence the required expression for y is 4 -1/3 x
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