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Working with Word Problems in Linear Equation

Working with Word Problems in Linear Equation. Day 2. Learning Goals Students can set up and solve equations from various type of word problems in linear equation. Warm-Up/ HW Check (Roadmap page 108, #12) Find the constant a if there is no solution to

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Working with Word Problems in Linear Equation

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  1. Working with Word Problems in Linear Equation Day 2

  2. Learning Goals Students can set up and solve equations from various type of word problems in linear equation.

  3. Warm-Up/ HW Check (Roadmap page 108, #12) Find the constant a if there is no solution to the equation of . 2. (Roadmap page 109, #17) Find the constant a, if the ratio of the solutions is 2 to 3 for the equations of , respectively.

  4. Now let’s move on to Word Problems in Linear Equations… Remember: Put Change Solve P.C.S.C! Check What does each word mean when solving word problems in Linear Equation?

  5. Type 1.Cost, Sales Price, and Discount Price (Example, #7, pg.113) 원가의 5할의 이익을 붙여 정가를 정한 어떤 상품이 팔리지 않아 정가의 3할을 할인하여 팔았더니 1500원의 이익이 생겼다. 이 상품의 정가를 구하여라. 정가 (Sales Price)= 원가 (Cost) +원가 x 이익률 (Profit (%)) 이익금(Profit) = 판매가 (Net Price) – 원가

  6. Type 2.Speed, Time, and Distance (Example, #14, pg.115) 형이 집에서 학교로 출발한 지 10분 후에 동생이 자전거로 같은 길을 따라 형을 쫓아갔다. 형은 시속 4km로 걷고, 동생은 시속 9km로 자전거를 타고 가면 동생은 출발한 지 몇 분 후에 형과 만나게 되는지 구하여라.

  7. Type 3.Working Rate (Example, #22, pg.117) It takes 12 days for Ji and 20 days for Ki to type a certain book. Diligent Ji started working first, and four days later Ki joined to complete the work. How many days did Ji and Ki work together?

  8. Type 4.Concentration(Example, #4, pg. 119)A beaker contains 300g of 10% salt water. Esther is taking out a cup of solution from the beaker and replacing them by the same amount of water. Then, she puts additional 20g of salt, which now makes15% solution. How much salt water did Esther take out? Recall concentration (%)= (amount of solute/amount of solution) x 100

  9. Type 5.Train & Tunnel (Example, #18, pg.116) 어떤 기차가 일정한 속력으로 길이 200m의 철교를 완전히 건너는 데 15초가 걸렸고, 이 기차가 같은 속력으로 길이 340m의 터널을 통과할 때는 12초 동안 기차가 보이지 않았다. 이 때 기차의 길이를 구하여라.

  10. Type 6.Hour hand & Minute hand (Example, #27, pg.118) Find the time between 4 and 5 o’clock when the HH and MH overlaps the HH and MH form a straight angle the HH and MH form a right angle for the first time

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