Which system if equations has no solutions?

3. solve by graphing: y = 2x + 6 x + y = -3

If 20% of a number is 35, what is 50% of that number?

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?