Chapter 3: Systems of Equations and Inequalities

To use a TI-83 Plus to solve a system of equations, graph both equations on the same screen. Then, select intersect, which is option 5 under the CALC menu, to find the coordinates of the point of intersection. Solve each system of equations to the nearest hundredth.

$\begin{array}{c}57.\frac{1}{2}y-5x=8\\ \frac{1}{3}y-8x=-7\end{array}$

Graph each inequality.

$57.x+y\le 3$

$\frac{1}{3}(x+5)=\frac{5}{6}$

Graph each inequality.

Evaluate each expression if $x=-2,y=6,$and $z=5$.

58.$2x-y+3z$.

Graph each inequality.

$58.y\ge 5+3x$

$\frac{4n+8}{4}=\frac{n}{3}$

Graph each inequality.

Evaluate each expression if $x=-2,y=6,$and $z=5.$

$-x+4y-2z$

Graph each inequality.

$\text{2}x+y>-4$