Question

The value of y varies directly with x. If x = 3, then y = 21. What is the value of x when y = 105? F لا | 1 1 3 H 7 J 15​

Answer 1

• J. 15

Explanation:

Direct variation formula:

• y = kx, k- coefficient of proportionality

Given:

• x = 3,
• y = 21

Find k:

• 21 = 3k
• k = 7

Value of x, when y = 105

• 105 = 7x
• x = 105/7
• x = 15

Correct choice is the last one