Given that x and y are in inverse proportion, and y1, y2 are values of y corresponding to the values x1,x2 of x respectively. Which of the following is correct?
x1y1=x2y2
Given x∝1y
Hence we have xy = k where k is constant
∴ if x=x1 and y=y1, then x1y1= k-----------------(1)
Again if x=x2 and y=y2, then x2y2= k------------------------(2)
Equating (1) and (2) , we have
x1y1=x2y2