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To say that an equation is directly proportional is somewhat incorrect. What we say instead is that a variable on one side of the equation (in other words, on one side of the equals sign) is directly proportional to another variable on the other side.

What this means is that if when one variable increases (gets bigger), the other one does, too, then these variables are directly proportional to each other.

For example, take the equation for velocity.

v = d/t

Here, v is velocity, d is distance, and tis time. Lets try a few numbers.

v = 100 miles/2 hours = 50mi/hr.

v = 200 miles/2 hours = 100mi/hr.

v = 400 miles/2 hours = 200mi/hr.

What you may notice here is that as the value of d (the number of miles being traveled), gets bigger, so does the value of v (velocity, or speed, in miles/hour). This is because, in this equation, velocity is directly proportional to distance.

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Q: What is a directly proportional equation?
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