Solve using ELIMINATION (with step by step explanation)

3x+y=-9
y=5x+7

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

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?

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28