91Ó°ÊÓ

Solve each system of equations.

$\begin{array}{l}9a+7b=−30\\ 8b+5c=11\\ −3a+10c=73\end{array}$

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

$\begin{array}{l}3yâ‰\yen 6x-15\\ 2y≤-x+3\end{array}$

What is the area of the square ABCD?

(A) 27 units ${}^{\text{2}}$

(B)$9\sqrt{2}$units ${}^{\text{2}}$

(C) 18 units ${}^{\text{2}}$

(D)$12\sqrt{2}$ units ${}^{\text{2}}$

Solve each system of equations by using substitution

$\begin{array}{c}\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}4c+2d=10\\ \text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â€‰â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â€‰}c+3d=10\end{array}$

Solve each system of inequalities by graphing.

$\begin{array}{c}yâ‰\yen x−2\\ y≤−2x+4\end{array}$

$2=\frac{3}{5}x-\frac{1}{3}x+\frac{2}{5}x$

Solve each system of equations by using either substitution or elimination 50$\begin{array}{c}3x+8y=23\\ 5x−y=24\end{array}$

What are the coordinates $\left(x,y\right)$ at which the graphs of $2x+3y=12$ and $2x-y=4$ intersect?

Solve the system of equations.

$\begin{array}{c}\text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰}\frac{1}{x}+\frac{3}{y}=\frac{3}{4}\\ \text{ â¶Ä‰â¶Ä‰â¶Ä‰â¶Ä‰â€‰â€‰â€‰â€‰}\frac{3}{x}−\frac{2}{y}=\frac{5}{12}\end{array}$

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

$50.g\left(-1\right)$