6 Which expression can be classified as linear?

(A) x2 + x-4 (6) 3x2 - 1

(C) 6x - (D) + 7

Step-by-step explanation:

A linear expression has the highest power of the variable to 1, i. e ax+b

So, in this case the questions is not well presented

But looking at options C.

6x

This is linear expression when compare to ax+b, but b=0

Looking at option D

7

This is also a constant and it is linear.

But the best answer is C because it is an expression that has variable x and it is function of x.