is 9+7x linear or a quadratic

Question

I really need this help, don't be green.

Answer 1

Linear means highest degree of the independent variable = 1.  

 

Quadratic has degree 2.

Answer 2

Suppose you let a variable y = 7x + 9

Try graphing this equation, does it look like a line or a curve?

 

Give it a shot and come back with a question if you're still confused.