The correct answer is letter "C. Slope of Function A = 2 × Slope of Function B."
The slope of graph A, has a slope of 6, as y = 6x - 1 is slope of 6. The graph of B is a line with slope of 3, because for every x to the right, y goes up 3.
Here are the following choices:
A. Slope of Function B = 2 × Slope of Function A.
B. Slope of Function A = Slope of Function B
C. Slope of Function A = 2 × Slope of Function B
D. Slope of Function B = - Slope of Function A