Sandra waits tables at Polly's Tamales. While she is working, she receives a discount on any food she buys. If an item normally
costs d dollars, Sandra can buy it for 2/3 d dollars. Last night at work, Sandra bought a taco salad that normally costs $9.
What price did Sandra pay for the taco salad?
Standard form of an exponential function is y=ab^x when x=0, y=3, 3=ab^0, so you can figure out that a=3 when x=-1, y=6, 6=3b^(-1), b^(-1)=2, b=1/2 so the equation is y=3(1/2)^x
