Answer:
- if we are given a system of non-linear equations than we can plot the graph of the system of equations in the coordinate plane and depending on the sign of the inequality shade the region. and see the intersection region to obtain the feasible region and also the intersection point of the two plane in order to obtain a optimal solution.
- Constraints play a vital role in the real-world situation.
<em>For example:</em> we are given a cost of 1 pencil and one pen and we are given the maximum amount one has: then this problem could be modeled by the inequalities.
Answer:
weeks
Step-by-step explanation:
Given
It takes 14 weeks to empty a lake
also it takes 20 weeks for a river to fill the lake
Part of lake empty in 1 week 
Part of lake filled in 1 week is 
And if both works simultaneously then


therefore it takes
weeks to fill it
You didn't type the equation correctly.
16 - x = 4
16 - 12 = 4
x = 12