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If $y$-intercept not equal $0$, is it still considered directly proportional?

Grigory M
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zbz.lvlv
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  • Can you tell us what you've tried? Do you understand what is meant by directly proportional? – Mathmo123 Jul 17 '14 at 13:04
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    @Mathmo123 It's not clear what "what have you tried" means for a terminology question. –  Jan 01 '15 at 18:56
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    @behaviour the terminology tag was added 5 hours ago...asking the op to clarify what isn't understood is not unreasonable. – Mathmo123 Jan 02 '15 at 00:06

2 Answers2

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No. Direct proportion is $y = c x$.

LinAlgMan
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"Directly proportional" means exactly that --- if $x$ doubles, then so does $y$. But if the $y$-intercept of the linear equation is nonzero, then the doubling condition does not hold.

rogerl
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