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y = 4x is a formula or open statement. It can be used to define the function,

f = [(x,y) : y = 4x} , commonly denoted by f(x) = 4x.

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Q: Is y equals 4x a function?
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Is 4x plus the square root of y equals 12 a linear function?

No.


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4x + y = 10 is a perfectly valid functional form. The standard form is 4x + y - 10 = 0


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