Xvaries directly as y, and x = 153 when y = 9. find x when y = 13.

a: 106

b: 157

c: 221

The value of x is 221 when  k = 17 and  y = 13.

Therefore the Option (C) is correct .

Step-by-step explanation:

As given

x varies directly as y.

x = ky

Where k is the constant of proportionality.

As given

x = 153 when y = 9

Put in the above

153 = 9k

k = 17

Now Find out the value of x when k = 17 and  y = 13.

x = ky

x = 17 × 13

x = 221

The value of x is 221 when  k = 17 and  y = 13.

Therefore the Option (C) is correct .

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step-by-step explanation:

step-by-step explanation: