91Ó°ÊÓ

Solve each system of equations by graphing.

$\begin{array}{c}\frac{1}{4}x+2y=5\\ 2x−y=6\end{array}$

Solve each system of inequalities by graphing.

$\begin{array}{c}21.\left|x+1\right|≤3\\ x+3yâ‰\yen 6\end{array}$

21: Solve each system of inequalities by graphing.

$\begin{array}{c}y≤4\\ y>-3\end{array}$

Solve each system of equations by using elimination

$\begin{array}{c}\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}3p−5q=6\\ \text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â€‰â€‰â€‰â€‰}2p−4q=4\end{array}$

Solve each system of equations

$\begin{array}{l}6x+2y+4z=2\\ 3x+4y−8z=−3\\ −3x−6y+12z=5\end{array}$

Graph each system of inequalities. Name the coordinates of the vertices of the feasible region. Find the maximum and minimum values of the given function for this region

$\begin{array}{c}21.x+y≤3\\ x+2y≤4\\ xâ‰\yen 0,yâ‰\yen 0\\ f(x,y)=3y−4x\end{array}$

22: Solve each system of inequalities by graphing.

$\begin{array}{c}\left|y\right|>3\\ x≤1\end{array}$

Solve each system of equations

$\begin{array}{c}r+s+t=5\\ 2r−7s−3t=13\\ \frac{1}{2}r−\frac{1}{3}s+\frac{2}{3}t=−1\end{array}$

Solve each system of equations by graphing.

$\begin{array}{c}\frac{2}{3}x+y=−3\\ y−\frac{1}{3}x=6\end{array}$

Solve each system of equations by using elimination

$\begin{array}{c}22.\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}4x−5y=17\\ \text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â€‰â€‰â€‰â€‰}3x+4y=5\end{array}$