Question 1129079
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You've done such a good job on what you have done; I'm surprised that the last constraint has you confused.<br<
You said x = amount invested in bonds and y = amount invested in stocks.  Using those directly, the constraint<br>
"the money invested in bonds must be at least twice as much as that in stocks"<br>
is<br>
x >= 2y<br>
Note also that your constraint on the total amount should be x+y <= 24000; you show x+y >= 24000.  I don't know if you really meant that, or if it was a typo.<br>
Other than that, I suspect you are capable of finishing the problem.  If not, send a note of thanks indicating where you are stuck and I can help further.