Pls help me get the right answer thx :D (letter D is none of the above)

Solve the system of equations. y= 2x y= x^2 - 15

Which equation matches the graph shown ?

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?