4.2+++Using+the+Symbolic+Method+10-11

May 29, 2011 A.L Block 7B Moving Straight Ahead Big Idea

Many real world situations can be modeled and predicted using mathematics. Essential Question #4: How can I use math symbols to describe a pattern? **problem 4.2= Using the Symbolic Method** Karen wants to buy a store from the Umlimeted Store on an installement plan. Thee store cost $305.

**A.)Write an equation you could solve to find the number of months it will take Karen to pay for the store.** **y=15x+30**

B.) Solve your equation by using the symbolic method. How many months will it take Karen to pay for the store? y=15x+30 305=15x30 305=30=275 275/15=18.3333=19.0 months

Problem 4.2 F.U 1.) In a-d use the symbolic method to sove the equation for x. Check your answers a.)y=2.5x when y=175

175=2.5x 175/2.5=70 175=25 x=70

b.) y=19+3 when y= 64

64=19+3 64-19=45 45/3=15 64=19+3x15 x=15

c.)y=2x-50 when y=15

15=2x-50 50+15=65 65/2=32.5 15=2x-50 x=32.5

d.) y=-2x+14 when y=60

y=-2x+14 60=-2x+14 60-14=46 y=-2x+14 x=-23

2