The functions f(x) and g(x) are described below:
f(x)= 3x - 7
g(x)= 3x + 8
The graph of g(x) is obtained by shifting up the graph of f(x) by __ units.
There's no choices. I have to give an answer. Please help!

Question

The functions f(x) and g(x) are described below:
f(x)= 3x - 7
g(x)= 3x + 8
The graph of g(x) is obtained by shifting up the graph of f(x) by __ units. 
There's no choices. I have to give an answer. Please help!

danjs · Answer

f(x) is the line 3x moved below x axis 7 units
g(x) is the same line 3x but moved above x axis 8 units

they are a distance 15 from each other in vertical direction

anonymous · Answer

So the answers 15?