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Pearson Algebra 1 Common Core, 2011

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Pearson Algebra 1 Common Core, 2011 View details

8. An Introduction to Equations

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Exercise 42 Page 57

Use mental math to guess the starting value for the table.

2

Practice makes perfect

We want to use a table to solve the given equation.

12=6-3b In order to choose a good starting point for our table, let's pretend that the equation is 12=-3b. What multiplied by -3 would get us close to 12? -4 would, so let's try it in our table. Due to fact that 6 is much bigger than - 3 we should also try two digits less and two digits greater.

b	6-3b	=
- 2	6 - 3( - 2)	12
- 3	6 - 3( - 3)	15
- 4	6 - 3( - 4)	18
- 5	6 - 3( - 5)	21
- 6	6 - 3( - 6)	24

We can see that b=-2 is the solution to our equation.

Subchapter links

Lesson Check p.56

Practice and Problem-Solving Exercises p.56-58

Standardized Test Prep p.58

Mixed Review p.58