91Ó°ÊÓ

Solve each system of equations by graphing.

4: Solve each system of equation by graphing, substitution, or elimination.

$\begin{array}{c}-4x+y=-5\\ 2x+y=7\end{array}$

Solve each system of inequalities. Sketch each graph on a sheet of paper.

4.$\begin{array}{l}yâ‰\yen x+2\\ y≤-2x-1\end{array}$

Solve each system of equations by using either substitution or elimination.

$\begin{array}{c}\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}2x+6y=2\\ 3x+2y=10\end{array}$

When 3 times $x$is increased by 4, the result is less than 16. Which of the following is a graph of the real numbers $x$that satisfy this relationship?

Solve each system of equations by using substitution

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

Solve each system of equations.

4.

$\begin{array}{l}x+2y=12\\ 3y−4z=25\\ x+6y+z=20\end{array}$

All $28$members in Crestview High School’s Ski Club went on one-day ski trip. Members can rent skis for $\backslash ( 16.00$per day or snowboards for $\backslash ) 19.00$per day. The club paid a total of $\$ 478$for rental equipment.

How many members rented skis and how many rented snowboards?

Choose the system of inequalities whose solution is represented by the graph.

$\begin{array}{c}A.y<−2\\ x<−3\\ B.y≤−2\\ x>−3\\ C.x≤−2\\ y>−3\\ D.x<−3\\ y<−3\end{array}$

STAMPS For Exercises 39 and 40, use the following information.

The table shows the price for first-class stamps since the U.S. Postal Service was created on July 1, 1971.

40. Predict the price for a first-class stamp issued in the year 2010.