Question 88547
y=2x+7 (red line)
y=2x (green line
{{{ graph( 300, 200, -6, 5, -10, 10, y = 2x +7, y = 2x) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = 2x +7 and y = 2x). 
It would appear from the 2 graphs  that the line is moved up the y axix 7 places. Thus answer C) is correct.