I need help really bad please

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

2x minus y equals 6, x plus y equals negative 3

Me i'm timed right now! a. (0,-5)b. (0,-3)c. (0,3) d. (0,5)