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Chapter 7 Linear and Second Degree Equations

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Identifying Equations Algebraic expressions separated by an equal sign See Example 7-1 on page 141 Solving Linear Equations Basic Rules 1.We can perform any mathematical operation on one side of the equation only if we perform the same operation on the other side

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Linear and Second Degree Equations Solving Linear Equations Basic Rules 2.Has five steps (Don’t forget Rule # 1) a.Clear all fractions (if any) b.Move all terms containing the unknown to one side (usually the left) and combine into one term c.Move constants to the other side (usually right) and combine d.Do operations necessary to get the coefficient of the unknown to’1’ e.Test your answer by sub in original equation.

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Solving Linear Equations Examples:

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Solving Linear Equations Examples:

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Solving Linear Equations Example:

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Solving Linear Equations Example continued :

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Second Degree Equations Key Points The square root of the square of a number is that number The square of the square root of a number is that number Do examples 7-9 on page 148 Thru 7-13 on page 150

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Applications Ohm’s Law E = I xR 1/R * E = I * R * 1/R E/R = [I * R]/R E/R = I Other Variation: R = E/I Power Equation Variations P = I * E I = E/R

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Applications

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