Question

Does the rule y = 2 · x + 4 represent a linear or an exponential function? Explain.

A.
Linear function; the function is in the form y = abx, where a ≠ 0, b > 0, b = ≠ 1 , and x is a real number.

B.
Linear function; the independent variable x is not an exponent.

C.
Exponential function; the function is in the form y = mx + b, where m = slope, b = y-intercept, and x is a real number.

D.
Exponential function; the function is in the form y = abx, where a ≠ 0, b > 0, b = ≠ 1 , and x is a real number.

Answer 1

B.
Linear function; the independent variable x is not an exponent.

But for me, answer is:

Linear function; the function is in the form y = mx + b, where m = slope, b = y-intercept, and x is a real number.