alleryStart learning →y is directly proportional to x. Increasing x from 4 to 10 increases y by 18. What is y when x = 5?
A45
B30
C20
D15
Answer & Solution
Correct answer: D. 15
The increase of six in x produces eighteen in y, giving ratio y/x = 3 and hence y = 15 at x = 5.
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