book Maths Puzzle Numerical Ability

How do I find out if this equation (y=2x+1) is linear or not?

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book Other Question

one glass contains 10 ounces of orange juice and a second glass contains the same amount of lemon juice. A dipper of the first is ladled into the second and throughly mixed. Then a Please help me with this problem.
Factor Completley.
6w^6-40w^5+50w^4

this is the answer I came up with please let me know if it is correct
2w^4(3w^2-20w^5+25)

Thank you