Verified answer

DIRECT VARIATION

Answer:

a. d=kt

Explanation:

• The distance d travelled by a car is directly proportional to the time t travelled.

Direct Variation

The statements:

1. “y varies directly as x”
2. “y is directly proportional to x”
3. “y is proportional to x”

may be translated mathematically as y=kx where k is the constant of variation.

For two quantities, x and y, an increase in x causes an increase in y as well. Similarly, a decrease in x causes a decrease in y.

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