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Khan Academy

Khan Academy: Practice: Slope From Two Points

For Students 8th
In this practice quiz, students are asked to calculate the slope of a line that passes through two given coordinate pairs. Includes hints.
Activity
Help Algebra

Help algebra.com: Polynomial and Rational Inequalities

For Students 9th - 10th
Learn to solve inequalities and how to graph their solutions on a number line. The examples contain quadratics and rational expressions.