I need help finding the value of y  

f(x)=3/4x +7

please help

That looks like it is really to be written as f(x) = 3x/4 + 7 or f(x) = (3/4)x + 7
to ensure that the x is in the numerator of the fraction.

The function f(x) is used in place of y, so we have y = 3x/4 + 7.
Subtracting 7 from both sides gives y - 7 = 3x/4.
Multiplying both sides by 4/3 gives (4/3)(y-7) = x.
Turning the equation around gives x = (4/3)(y-7).

This can be rewritten as x = 4(y-7)/3 or x = (4y-28)/3 or x = 4y/3 - 28/3.

The answer book should have it in one of these forms.


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Scott A Wilson


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