Question 22623
What you have done so far looks right.

20x + 10 <= -1/2y


Now multiply both sides by -2, which of course reverses the inequality sign:

-2(20x + 10) >= -2(-1/2y)
-40x - 20 >= y


You probably don't want y on the right side so switch sides, but when you do this reverses the inequality again:

-40x - 20 >= y
y<=-40x-20


Is that what you wanted to do??


R^2 at SCC