Answer:
B.
When working with functions, you can replace the f(x) with y. This linear function is in the slope-iintercept form, y = mx + b, and the slope of this line = 2.
Parallel lines have the same slope, so any line with a slope of 2 would be parallel to this one. Any function in the form f(x) = 2x + ? would be parallel.
Hope this helps!
