Warm-Up Exercises EXAMPLE 1 Write reasons for each step Solve 2x + 5 = 20 – 3x. Write a reason for each step. Equation ExplanationReason 2x + 5 = 20 –

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Presentation transcript:

Warm-Up Exercises EXAMPLE 1 Write reasons for each step Solve 2x + 5 = 20 – 3x. Write a reason for each step. Equation ExplanationReason 2x + 5 = 20 – 3x Write original equation. Given 2x x =20 – 3x + 3x Add 3x to each side. Addition Property of Equality 5x + 5 = 20 Combine like terms. Simplify. 5x = 15 Subtract 5 from each side. Subtraction Property of Equality x = 3 Divide each side by 5. Division Property of Equality

Warm-Up Exercises EXAMPLE 1 Write reasons for each step The value of x is 3.ANSWER

Warm-Up Exercises EXAMPLE 2 Use the Distributive Property Solve -4(11x + 2) = 80. Write a reason for each step. SOLUTION Equation ExplanationReason –4(11x + 2) = 80 Write original equation. Given –44x – 8 = 80 Multiply. Distributive Property –44x = 88 Add 8 to each side. Addition Property of Equality x = –2 Divide each side by –44. Division Property of Equality

Warm-Up Exercises EXAMPLE 3 Use properties in the real world Heart Rate When you exercise, your target heart rate should be between 50% to 70% of your maximum heart rate. Your target heart rate r at 70% can be determined by the formula r = 0.70(220 – a) where a represents your age in years. Solve the formula for a. SOLUTION Equation ExplanationReason r = 0.70(220 – a) Write original equation. Given r = 154 – 0.70a Multiply. Distributive Property

Warm-Up Exercises EXAMPLE 3 Use properties in the real world r – 154 = –0.70a Subtract 154 from each side. Subtraction Property of Equality –0.70 r – 154 = a Divide each side by –0.70. Division Property of Equality Equation ExplanationReason

Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2 and 3 In Exercises 1 and 2, solve the equation and write a reason for each step. Equation ExplanationReason 4x + 9 = –3x + 2 Write original equation. Given 7x + 9 = 2 Add 3x to each side. Addition Property of Equality Subtract 9 from each side. Subtraction Property of Equality x = –1 Divide each side by 7. Division Property of Equality 7x = –7 1. 4x + 9 = –3x + 2

Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2 and x + 3(7 – x) = –1 14x + 3(7 – x) = –1 Write original equation. Given 14x x = –1 Multiply. Distributive Property 11x = –22 Subtract 21 from each side. Subtraction Property of Equality x = –2 Divide each side by 11. Division Property of Equality 11x +21= –1 Simplify Link the same value Equation ExplanationReason

Warm-Up Exercises GUIDED PRACTICE for Examples 1, 2 and 3 Formula ExplanationReason Write original equation. Given A = 1 2 bh Multiply Multiplication property Divide Division property 3. Solve the formula A = bh for b A = bh 2A = b h

Warm-Up Exercises EXAMPLE 4 Use properties of equality LOGO You are designing a logo to sell daffodils. Use the information given. Determine whether m EBA = m DBC. SOLUTION Equation ExplanationReason m 1 = m 3 Marked in diagram. Given m EBA = m 3+ m 2 Add measures of adjacent angles. Angle Addition Postulate m EBA = m 1+ m 2 Substitute m 1 for m 3. Substitution Property of Equality

Warm-Up Exercises EXAMPLE 4 Use properties of equality m 1 + m 2 = m DBC Add measures of adjacent angles. Angle Addition Postulate m EBA = m DBC Transitive Property of Equality Both measures are equal to the sum of m 1 + m 2.

Warm-Up Exercises EXAMPLE 5 Use properties of equality In the diagram, AB = CD. Show that AC = BD. SOLUTION Equation ExplanationReason AB = CD Marked in diagram. Given AC = AB + BC Add lengths of adjacent segments. Segment Addition Postulate BD = BC + CD Add lengths of adjacent segments. Segment Addition Postulate

Warm-Up Exercises EXAMPLE 5 Use properties of equality AB + BC = CD + BC Add BC to each side of AB = CD. Addition Property of Equality AC = BD Substitute AC for AB + BC and BD for BC + CD. Substitution Property of Equality

Warm-Up Exercises GUIDED PRACTICE for Examples 4 and 5 Name the property of equality the statement illustrates. Symmetric Property of Equality ANSWER 5. If JK = KL and KL = 12, then JK = 12. ANSWER Transitive Property of Equality 4. If m 6 = m 7, then m 7 = m 6.

Warm-Up Exercises GUIDED PRACTICE for Examples 4 and 5 6. m W = m W ANSWER Reflexive Property of Equality