91Ó°ÊÓ

$\frac{1}{3}w+\frac{5}{4}=w-\frac{1}{4}$

: Answer the question that was posed at the beginning of the lesson. How can a system of equations be used to make consumer decisions?

Include the following in your answer:

• a solution of the system of equations in the application at the beginning of the lesson, and
• an explanation of how Yolanda can use a graph to decide whether she should change to a long-distance plan that charges \(0.10 per minute and a flat fee of \)3.00 per month.

Find each value if$f\left(x\right)=4x+3$ and $g\left(x\right)=5x-7$ .

$51.g\left(3\right)$

Which equation has the same graph as $4x+8y=12$?

$\begin{array}{c}\text{A.}x+y=3\\ \text{B.}2x+y=3\\ \text{C.}x+2y=3\\ \text{D.}2x+2y=6\end{array}$

Define a variable and write an equation that can be used to determine on average how much the annual per-pupil spending has increased from 1986 to 2001.

$\frac{1}{2}a-\frac{1}{4}=\frac{1}{6}a+\frac{1}{12}$

Find each value if$f\left(x\right)=4x+3$ and $g\left(x\right)=5x-7$ .

localid="1647958491086" $f\left(6\right)$

Define a variable and write an equation that can be used to determine on average how much the annual per-pupil spending has increased from 1986 to 2001. Solve the problem

If $x=y+z$and $x+y=6$and $x=10$, then $z=$

$\begin{array}{l}A.\text{ â¶Ä‰}4\\ B.\text{ â¶Ä‰}8\\ C.\text{ â¶Ä‰}14\\ D.\text{ â¶Ä‰}16\end{array}$

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.

$\begin{array}{c}52.y=0.125x−3.005\\ y=−2.58\end{array}$