The answer to this problem is -7
Explanation:
this is because g(x) is actually the y and so your new problem is y = -3/4 x + 2 and so you plot this on a graph and by using the rise over run strategy, you should get the answer -7. If you have a graphing calculator, you can go to y= (top left button) and punch the equation in, you should get a linear line. Next you type the trace button (4th button at the top) and go to x = 12 and the y should equal -7