In the equation y - x -3- y is directly proportional to X-A- Inverse proportionB- Direct proportion

The correct option is A Inverse proportion Condition for direct proportionality is (x/y) = constant and condition for inverse proportionality is xy= constant ...

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Standard VII

Mathematics

Direct Proportions

In the equati...

Question

In the equation $y = x + 3, y$ is directly proportional to $x$ .

Direct proportion

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Inverse proportion

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Solution

The correct option is B
Inverse proportion

Condition for direct proportionality is $(\frac{x}{y}) = c o n s t a n t$ and

condition for inverse proportionality is $x y = c o n s t a n t$

So, the given equation $y = x + 3, y$ is neither directly nor inversely proportional to $x$ .

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In the equation y = x + 3, y is directly proportional to x.

Question 10

Both x and y are in direct proportion, then $\frac{1}{x}$ and $\frac{1}{y}$ are
(a) In indirect proportion
(b) In inverse proportion
(c) Neither in direct in inverse proportion
(d) Sometimes in direct and sometimes in inverse proportion

Consider the equation x(y + 1) = x + 3 . Check whether x is directly or inversely proportional to y. [3 MARKS]

Consider the equation $y = \sqrt{2} x$ . Which of the following is/are true?

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In the equation y=x+3,y is directly proportional to x.

The correct option is B Inverse proportion Condition for direct proportionality is (xy)=constant and condition for inverse proportionality is xy=constant So, the given equation y=x+3,y is neither directly nor inversely proportional to x.

In the equation $y = x + 3, y$ is directly proportional to $x$ .

The correct option is B
Inverse proportion

Condition for direct proportionality is $(\frac{x}{y}) = c o n s t a n t$ and

condition for inverse proportionality is $x y = c o n s t a n t$

So, the given equation $y = x + 3, y$ is neither directly nor inversely proportional to $x$ .