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The rule for adding terms. Subtracting a negative number. 1 4. Multiplying and dividing signed numbers, the Rule of Signs. 1 5. Reciprocals and zero. The definition of reciprocals. The definition of division. The general form. Parallel and perpendicular lines. The point-slope formula. The two-point formula. 35. Simultaneous linear equations The method of addition. The method of substitution. Cramer's Rule: The method of determinants. Three equations in three unknowns. Rules for 0. 1 6. Some rules of algebra, the rule of symmetry. Commutative rules. Inverses. Two rules for equations. 1 7. Removing grouping symbols, parentheses. Brackets. Braces. The relationship of b a to a b. 24. Equations with fractions Clearing of fractions. 25. Word problems that lead to equations with fractions The whole is equal to the sum of the parts. Same time problem: Upstream-downstream. Total time problem. Home 1 1. Algebraic expressions, the four operations and their signs. The function of parentheses. Terms versus factors. Powers and exponents. The order of operations. Evaluating algebraic expressions. 1 2. Signed numbers: Positive and negative, the absolute value and the algebraic sign.