Which function is linear?

Q:

A:

A) f (x) = 5x2 + 10

B) f (x) =

5

x

+ 10

C) f (x) = 5x2 - 10

D) f (x) =

x

5

- 10

Answer: The Answer Is (D.

Step-by-step explanation:

f (x) =

x

5

- 10

A function is linear if it can be expressed in the form f (x) = mx + b or if its graph is a straight line.

f (x) = mx + b

f (x) =

x

5

- 10

f (x) =

1

5

x - 10

probably b

Step-by-step explanation:

I think for the other 3 answers, you are trying to have the x's have exponents, making them non-linear. While since b increases by 5 when x increases by 1, it is a linear function