Question

Both x and y vary directly with each other and when x is 20, y is 28, which of the following is not a possible pair of corresponding values of x and y? 25 and 35 21 and 15 55 and 77​

Answer 1

Answer:

21 and 15

Step-by-step explanation:

$\frac{x}{y} = \frac{20}{28} = \frac{5}{7}$

so

$\frac{5}{7}$

is constant

so

$\frac{25}{35} = \frac{55}{77} = \frac{5}{7}$

it means they are directly proportional

but,

$\frac{21}{15} = \frac{7}{5}$

so , 21 and 15 are not directly proportional

hope it helps..

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