91Ó°ÊÓ

Determine whether or not the point (-1,3) satisfies the inequality. a. \(x-3 y>6\) b. \(x<3\) c. \(y \leq 3\) d. \(y \leq-\frac{1}{2} x+3\)

For the linear system \(\left\\{\begin{array}{l}x-y=5 \\ 2 x+y=1\end{array}\right.\) a. Graph the system. Estimate the solution for the system and then find the exact solution. b. Check that your solution satisfies both of the original equations.

Two investments in high-technology companies total \(\$ 1000 .\) If one investment earns \(10 \%\) annual interest and the other earns \(20 \%,\) find the amount of each investment if the total interest earned is \(\$ 140\) for the year (clearly in dot com days).