Question

Is y=0.5x + 2 a linear function

Answer 1

To rephrase your question,

Does
`y=0.5+2` hold the form of
`y=mx+n`?

The answer is yes.

Hope this helps.

Note:

Pedantic answer should be considered. In the above answer
`y = \dots` is not a function but rather an equation of a line.