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Two quantities $x$ and $y$ are in direct proportion when:

Class 8Direct and Inverse ProportionsDirect and Inverse Proportions

A $\frac{y}{x}$ stays constant
B $x$ times $y$ stays constant
C $x + y$ stays constant
D $x - y$ stays constant

Step-by-Step Solution

In direct proportion, as

x

increases

y

increases in the same ratio, so

\frac{y}{x}

is a constant (k). This means

y = k x

.

Answer: A)

\frac{y}{x}

stays constant

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