Quote Originally Posted by acrca
A. 84x+7y is bigger than or equal to 70
B. 4.8x-0.12y<7.2
just those 4 now....
84x + 7y ≥ 70
everything over 7
12x + y ≥ 10
subtract 12x from both sides
y ≥ 10 - 12x
pwnt
the next is
4.8x - 0.12y < 7.2
multiply everything by 100
480x - 12y < 720
subtract 480x
-12y < 720 - 480x
divide by -12, inequality sign flips
y > 40x - 60
done