
is directly proportional to . Write an equation that shows the relationship if and ?
Answer
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Hint: To solve such problems always remember that directly proportional means where is any constant. Here the equation can be formed by substituting the values of and in . This will give the value of the constant and thus the equation.
Complete step-by-step solution:
Given that is directly proportional with . That is,
where is any constant.
Also given that and .
Substitute this in . That is,
Therefore, the value of the constant is .
Hence the equation that shows the relationship if and is as shown below
.
Additional Information: Suppose that there are two quantities and . If these two quantities increase or decrease at a constant rate then they are said to be directly proportional. If and are directly proportional then it can be written as . Here means proportional to.
If an increase in causes a decrease in or vice versa then the quantities are said to be in inverse proportion. If and are inversely proportional then it can be written as . If is inversely proportional to , then it can be written as , where is any constant. Here is called the constant of proportionality of the relationship.
Note: Always remember that if the question says is directly proportional to , then it means will be a constant multiple of . It can also be said that if is directly proportional to , then or . If are the values corresponding to and are the values corresponding to , also if is directly proportional to , then .
Complete step-by-step solution:
Given that
Also given that
Substitute this in
Therefore, the value of the constant is
Hence the equation that shows the relationship if
Additional Information: Suppose that there are two quantities
If an increase in
Note: Always remember that if the question says
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