91Ó°ÊÓ

Solve each system graphically. $$ \begin{aligned} &4 x-20=5 y\\\ &8 x-10 y=12 \end{aligned} $$

Write an equivalent expression using positive exponents. Then, if possible, simplify. $$ (a b)^{-2} $$

Write an equivalent expression using negative exponents, \(\frac{1}{x^{t}}\)

Simplify. $$ 4.2-10.7 $$

Write an equivalent expression using positive exponents. Then, if possible, simplify. $$ \left(7^{8}\right)^{5} $$

Find the slope of the line containing each given pair of points. \((-1,7)\) and \((-3,4)\)

Solve. $$ 4-(6+x)=13 $$

Find the slope and the \(y\) -intercept of each equation. \(y=4-x\)

The sum of two numbers is \(89 .\) One number is 3 more than the other. Find the numbers.

Supplementary angles are angles for which the sum of their measures is \(180^{\circ}\) Two angles are supplementary. One angle is \(33^{\circ}\) more than twice the other. Find the measure of each angle.