4.2+Using+the+Symbolic+Method

June 1st, 2009 M.J.D. Big Idea: Many real world situations can be modeled and predicted using mathematics. __ Essential Question: How can I use math symbols to describe a pattern? __ Problem 4.2 //A. Write an equation you could solve to find the number of months it will take Karen to pay for the stove.// Cost=30+15N B. //Solve your equation by using the symbolic method//. //How many months will it take to Karen to pay for the stove?// 305=30+15N 305-30=30-30+15N 275=15N 275/15=15N/15 N=18.333 rounded to 19 months. Follow Up 1. a. y=2.5x when y=175 //175/2.5 x=70// b. y=19+3x when y = 64 //64-19=45 45/3=15. x=15// c. y=2x-50 when y=15 //-50=+50 15=50=65/2=32.5. x=32.5// d.y=-2x+14 when y=60 //60-14=46=-2x=-23. x=-23// 2. What other methods could you use to solve x for the equations in question 1? //You could use algebra, Guess and Check, Work Backwards.//