If two quantities x and y are in direct proportion, then x_1/y_1 equals:

x_2/y_2. In direct proportion the ratio x/y is constant, so x_1/y_1 = x_2/y_2 for any two corresponding pairs.

If two quantities $x$ and $y$ are in direct proportion, then $\frac{x _{1}}{y _{1}}$ equals:

Class 8Direct and Inverse ProportionsDirect and Inverse Proportions

In direct proportion the ratio

\frac{x}{y}

is constant, so

\frac{x _{1}}{y _{1}} = \frac{x _{2}}{y _{2}}

for any two corresponding pairs.

Answer: A)

\frac{x _{2}}{y _{2}}

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