GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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y varies directly as x such that when x=10, y=4. Find y when x=15.
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4
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6
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8
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10
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Explanation:
Detailed explanation-1: -Or in other words, y = k * x. If x=4 when y=10, we have the equation 10 = k * 4. Solving for k by dividing both sides of the equation by 4, we get that k = 10/4 or 5/2 or 2.5 if you want to use a decimal. So the formula for this situation is y = 2.5x.
Detailed explanation-2: -For direct variation, if x varies directly as y then x=my x = m y, where m is a proportionality constant.
Detailed explanation-3: -The phrase “ y varies directly as x” or “ y is directly proportional to x” means that as x gets bigger, so does y, and as x gets smaller, so does y.
There is 1 question to complete.