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After studying this section, you will be able to:
- solve inequalities with one variable
- solve inequalities with two variables
Inequalities in one variable
When working with a double inequalities start by solving the two inequalities. An integer is any whole number, positive negative or zero.
When solving inequalities do not forget that multiplying or dividing by a negative number reverses the inequality sign:
−x > 3, becomes x < −3 (multiplying by −1).
Inequalities in two variables
NOTE:Remember an equation in the form y = 2x – 1 has gradient 2 and y-intercept (where it crosses the y-axis) of –1,
in other words y = (gradient) x + (y -intercept)