91Ó°ÊÓ

Let \(x=-2\) and \(y=3\) and evaluate each expression. $$y-x^{2}$$

State the value that is needed as a multiplier of the first equation to eliminate the variable \(x\) in each system. Do not solve.$$\left\\{\begin{array}{l}x-5 y=1 \\\\-3 x+4 y=6\end{array}\right.$$

Determine whether the graph of each inequality should be shaded above or below the boundary. $$y>x-2$$

For each of the following, identify the two variables needed to set up a system of equations and write a description of what each variable represents. A nurse needs 25 milliliters of a \(15 \%\) saline solution but only has \(9 \%\) saline solution and \(20 \%\) saline solution available.

Determine whether the graph of each inequality should be shaded above or below the boundary. $$y \leq x+4$$

Let \(x=-2\) and \(y=3\) and evaluate each expression. $$-x^{2}+y^{3}$$

For each of the following, identify the two variables needed to set up a system of equations and write a description of what each variable represents. The cost of 6 shirts and 3 pairs of jeans is \(\$ 123 .\)

State the value that is needed as a multiplier of the first equation to eliminate the variable \(x\) in each system. Do not solve. $$\left\\{\begin{array}{l}x+3 y=4 \\\4 x-2 y=7\end{array}\right.$$

Determine whether the ordered pair (-2,1) is a solution to each equation. $$y=\frac{3}{4} x+\frac{5}{2}$$

Let \(x=-2\) and \(y=3\) and evaluate each expression. $$\frac{3 x-2 y}{2 x+y}$$