If g = x - 9, and if x = 15, what is g?
a) 3
b) 6
c) 7
d) 23

B ) 6
Substitute 15 in the equation for x.
G=15-9
G=6

The answer is 6.
Here's why:
The equation that we have is g=x-9 , we already know the value of x , but not the value of g.
If x=15 , the new equation is:
g=15 - 9
15-9= 6
That's why the correct answer is B .

Look i don’t know the answer to this but someone else will so just wait a little bit longer