Is $y = -x$ a direct variation equation and if so what is the constant?

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Answer 1 · 2016-03-05T23:30:12

This is not a direct variation equation.
This is because as y increases, x decreases

For example, if y =0, then x = 0

But when y increases to 1, x would decrease to -1 (1 = -(-1))

Is y = -xy = -x a direct variation equation and if so what is the constant?