91Ó°ÊÓ

Solve by determinants. $$\begin{aligned} &\frac{x}{3}+\frac{y}{4}=8\\\ &x-y=-3 \end{aligned}$$

Solve by determinants. Evaluate the determinants by calculator or by minors. $$\begin{aligned}&x-2 y+2 z=5\\\&5 x+3 y+6 z=57\\\&x+2 y+2 z=21\end{aligned}$$

Solve each system of equations by calculator using the unit matrix method. Two Equations in Two Unknowns. $$\begin{aligned} &\frac{x}{3}+\frac{y}{2}=1\\\ &\frac{x}{2}-\frac{y}{3}=-1 \end{aligned}$$

Solve by determinants. $$\begin{aligned} &\frac{x}{2}+\frac{y}{3}=5\\\ &\frac{x}{3}+\frac{y}{2}=5 \end{aligned}$$

Solve each system of equations by calculator using the unit matrix method. Two Equations in Two Unknowns. $$\begin{aligned} &\frac{x}{2}-\frac{3 y}{4}=0\\\ &\frac{x}{3}+\frac{y}{4}=0 \end{aligned}$$

Solve by determinants. Evaluate the determinants by calculator or by minors. $$\begin{aligned}&3 x+y=5\\\&2 y-3 z=-5\\\&x+2 z=7\end{aligned}$$

Solve by determinants. Evaluate the determinants by calculator or by minors. $$\begin{aligned}&.2 x-4 y+3 z=10\\\&3 x+y-2 z=6\\\&x+3 y-z=20\end{aligned}$$

Solve each system of equations by calculator using the unit matrix method. Three Equations in Three Unknowns. $$\begin{aligned} &x+y+z=18\\\ &x-y+z=6\\\ &x+y-z=4 \end{aligned}$$

Solve by determinants. $$\begin{aligned} &\frac{3 x}{5}+\frac{2 y}{3}=17\\\ &\frac{2 x}{3}+\frac{3 y}{4}=19 \end{aligned}$$

Solve each system of equations by calculator using the unit matrix method. Three Equations in Three Unknowns. $$\begin{aligned} x+y+z &=12 \\ x-y &=2 \\ x-z &=4 \end{aligned}$$