Question

is Y = 2x + 4 proportional or non-proportional

Answer 1

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You have to know that a direct variation is a linear equation with y intercept 0. It is a linear equation but it is not a direct proportion.

Answer 2

A proportional function is in the form y = kx, i.e. your function is not proportional.
y = 2x is proportional
y = 2x + 4 is not.