Pauline's cell phone bill is $39.99 a month for a fixed amount of minutes. For any minute she goes over the allowed amount, she is charged $0.50 per minute. The equation y=39.99+0.50x represents her phone bill, where y is the total bill and x is the number of minutes.

Which variable is the independent variable?

A.

x

B.

y

C.
There is no relationship between the variables.

Question

Pauline's cell phone bill is $39.99 a month for a fixed amount of minutes. For any minute she goes over the allowed amount, she is charged $0.50 per minute. The equation y=39.99+0.50x represents her phone bill, where y is the total bill and x is the number of minutes. 

Which variable is the independent variable?
	
	
 
A.
	

x
	
 
B.
	

y
	
 
C.
	There is no relationship between the variables.