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September 6th, 2018, 08:20 AM   #11
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Originally Posted by skipjack View Post
That doesn't make sense, zylo.
whoops, sorry about the typo. thanks.

y=15bx-35>0 above the line y=15bx-35.

all points on the line y=4-3bx which are above the line y=15bx-35 also satisfy 15bx-35>0.

To visualize it, sketch both lines.

Point of intersection is at 4-3bx=15bx-35. So both conditions satisfied for x<(39/12b).

Last edited by zylo; September 6th, 2018 at 08:57 AM.
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September 6th, 2018, 09:42 AM   #12
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I think 15bx-20>15 should have been 15bx-20>35 in your initial line. The rest would then need changing as a consequence.
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