Question

solve 3C. Graph the system of inequalities in part (b). Use only the first quadrant and it’s boundary, because x and y are nonnegative.

Answer 1

We need the graph of the following inequalities:

$\begin{gathered} x+y\leq20 \\ x\ge3 \\ x\leq7 \end{gathered}$

The graph for the first inequality

$x+y\leq20$

is:

Now, fot the second inequality, the graph is:

and for the third inequality, the graph is:

By combining the above graph, the answer is:

The area they all meet is: