Which of the following graphs is a function?

y = x − 1
x =-1
x = y2 − 1

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Which of the following is the result of expanding

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?