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y is directly proportional to x . Write an equation that shows the relationship if x=2 and y=6 ?

Answer
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Hint: To solve such problems always remember that directly proportional means y=Kx where K is any constant. Here the equation can be formed by substituting the values of x and y in y=Kx . This will give the value of the constant and thus the equation.

Complete step-by-step solution:
Given that y is directly proportional with x . That is,
y=Kx where K is any constant.
Also given that x=2 and y=6 .
Substitute this in y=Kx . That is,
  6=K×2
K=3
Therefore, the value of the constant is K=3 .

Hence the equation that shows the relationship if x=2 and y=6 is as shown below
y=3x.


Additional Information: Suppose that there are two quantities x and y . If these two quantities increase or decrease at a constant rate then they are said to be directly proportional. If x and y are directly proportional then it can be written as x α y . Here α means proportional to.
If an increase in x causes a decrease in y or vice versa then the quantities are said to be in inverse proportion. If x and y are inversely proportional then it can be written as x α 1y . If y is inversely proportional to x , then it can be written as y=Kx , where K is any constant. Here K is called the constant of proportionality of the relationship.

Note: Always remember that if the question says y is directly proportional to x , then it means y will be a constant multiple of x . It can also be said that if y is directly proportional to x , then yx=K or y=Kx . If x1,x2 are the values corresponding to x and y1,y2 are the values corresponding to y, also if y is directly proportional to x , then y1x1=y2x2 .
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