Which graph represents - 12x - 4y <5?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%