Question

In a direct variation, the constant of proportionality is -3.

Which of the following would be its equation?

y = -3 x
-3 = xy
y = x - 3
-3 y = x
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Answer 1

In a direct variation, the relationship between the variables can be expressed in the form \( y = kx \), where \( k \) is the constant of proportionality. Given that the constant of proportionality is \(-3\), the equation would be:

\[ y = -3x \]

So the correct equation is:

**y = -3x**