91Ó°ÊÓ

In Exercises \(7-16\), sketch the graph of the system of linear inequalities. $$ \left\\{\begin{array}{l} x<3 \\ x>-2 \end{array}\right. $$

In Exercises 7-12, solve the system by the method of elimination. $$ \left\\{\begin{array}{l} 2 a+5 b=3 \\ 2 a+b=9 \end{array}\right. $$

In Exercises \(7-10\), use a system of linear equations to solve the problem. The selling price of a watch is \(\$ 108.75\). The markup rate is \(45 \%\) of the wholesale cost. Find the wholesale cost.

In Exercises 5-14, solve the system by the method of substitution. $$ \left\\{\begin{array}{r} 2 x=8 \\ x-2 y=12 \end{array}\right. $$

In Exercises \(5-10\), solve the system by graphing. $$ \left\\{\begin{array}{l} y=2 x-4 \\ y=-\frac{1}{2} x+1 \end{array}\right. $$

In Exercises \(5-10\), solve the system by graphing. $$ \left\\{\begin{array}{l} y=\frac{1}{2} x+2 \\ y=-x+8 \end{array}\right. $$

In Exercises 7-12, solve the system by the method of elimination. $$ \left\\{\begin{array}{r} 4 a+5 b=9 \\ 2 a+5 b=7 \end{array}\right. $$

In Exercises \(7-10\), use a system of linear equations to solve the problem. The selling price of a cellular phone is \(\$ 149.92\). The markup rate is \(60 \%\) of the wholesale cost. Find the wholesale cost.

In Exercises 5-14, solve the system by the method of substitution. $$ \left\\{\begin{array}{r} 2 x-y=0 \\ 3 y=6 \end{array}\right. $$

In Exercises \(7-16\), sketch the graph of the system of linear inequalities. $$ \left\\{\begin{array}{l} y>-1 \\ y \leq 2 \end{array}\right. $$