3.1 Warm Up Warm Up Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation Solve One-Step Equations.

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3.1 Warm Up Warm Up Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation Solve One-Step Equations

3.1 Warm-Up Solve using mental math. 1.x + 2 = 17 ANSWER 15 ANSWER x 6 = 4 3.x – 7 = 3 ANSWER 10 ANSWER x = 54

3.1 Warm-Up 5. Katrina divided her photos into three albums. Each album contains 26 photos. How many photos did Katrina have to begin with? ANSWER 78 photos

3.1 Example 1 Solve x + 7 = 4. x + 7 = 4x + 7 = 4 Write original equation. x + 7 – 7 = 4 – 7 Use subtraction property of equality: Subtract 7 from each side. x = –3x = –3 Simplify. ANSWER The solution is –3.

3.1 Example 1 CHECK Substitute –3 for x in the original equation. x + 7 = 4x + 7 = 4 Write original equation. –3 + 7 = 4 ? Substitute – 3 for x. 4 = 44 = 4 Simplify. Solution checks.

3.1 Example 2 Solve x – 12 = 3. Horizontal format Vertical format x – 12 = 3 Write original equation. x – 12 = 3 Add 12 to each side x = 15 Simplify. x = 15 x – =

3.1 Example 3 Solve –6x = 48. –6x = 48 x = –8 Write original equation. –6x –6 48 –6 = Divide each side by –6. Simplify.

3.1 Guided Practice 1. y + 7 = 10 ANSWER 3 Solve the equation. Check your solution. 2. x – 5 = 3 8 ANSWER 3. q – 11 = –5 6 ANSWER 4. 6 = t – 2 8 ANSWER 5. 4x = ANSWER 6. –65 = –5y 13 ANSWER 7. 6w = –54 –9–9 ANSWER = –8n –3–3 ANSWER

3.1 Example 4 Write original equation. 4 x 4 = 4 5 Multiply each side by 4. x = 20 Simplify. = 5. x 4 Solve SOLUTION = 5 x 4

3.1 Guided Practice 9.9. = 9 t –3 Solve the equation. Check your solution. –27 ANSWER 12. = –11 a 5 –55 ANSWER c 7 = 42 ANSWER z –2 = –26 ANSWER

3.1 Example 5 SOLUTION Write original equation. x = 4x = – x = – Solve 7 2 – The coefficient of x is. 7 2 – The reciprocal of. 2 7 – is ( ) ( x ) = 2 7 – 7 2 – 7 2 – 4 2 Multiply each side by the 7 – reciprocal,. x = –14 Simplify.

3.1 Example 5 ANSWER The solution is –14. Check by substituting –14 for x in the original equation. CHECK Write original equation. Substitute –14 for x. 4 = 4 Simplify. Solution checks. x = 4x = – (–14) = 4 ? 2 7 –

3.1 Guided Practice Solve the equation. Check your solution. w = ANSWER 12 p = ANSWER =9 = –3 4 m ANSWER – –8 = –4 5 v ANSWER 10

3.1 Example 6 Let r represent Crawford's speed in meters per second. Write a verbal model. Then write and solve an equation. SOLUTION OLYMPICS In the 2004 Olympics, Shawn Crawford won the 200 meter dash. His winning time was seconds. Find his average speed to the nearest tenth of a meter per second.

3.1 Example 6 Crawford's average speed was about 10.1 meters per second. ANSWER r = 200 = r r

3.1 Guided Practice 17. WHAT IF? In example 6, suppose Shawn Crawford ran 100 meters at the same average speed he ran the 200 meters. How long would it take him to run 100 meters ? Round your answer to nearest tenth of a second. 9.9 sec ANSWER

3.1 Lesson Quiz 2. 8 = m – 7 ANSWER 15 ANSWER k = –72 ANSWER –8–8 1. –6 + a = –2 Solve the equation. Check your solution. ANSWER – = x –5

3.1 Lesson Quiz ANSWER sec 5. Earth orbits the Sun at an average speed of kilometers per second. Find how long it takes, to the nearest hundredth of a second, for Earth to travel 500 kilometers.