How to solve this problem 2x-1=y, 2y+3=x

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

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

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?