Question

The value of y varies directly with x. If x=104, then y=78. What is the value of x when y=39?

58
58

52
52

29.25
29.25

69.3

Answer 1

Answer: 52

Step-by-step explanation:

Since the value of y varies directly with x, y = kx where k is a constant.

Since x=104, then y=78, we need to calculate the constant k. This will be:

y = kx

78 = 104k

k = 78/104

k = 0.75

What is the value of x when y=39?

Since y = =kx

39 = 0.75x

x = 39/0.75

x = 52