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Pearson Algebra 1 Common Core, 2011 View details

8. An Introduction to Equations

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Exercise 40 Page 57

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

y=-2

Practice makes perfect

We want to use a table to solve the given equation. 0=4+2y In order to choose a good starting point for our table, let's pretend that the equation is 0=2y. What multiplied by 2 would get us close to 0? 0 is a good guess, so let's start our table there. We should also try one digit less and one greater, just to be on the safe side.

y	4+2y	=
1	4+2 (1)	6
0	4+2 (0)	4
- 1	4+2 (- 1)	2
- 2	4+2 (- 2)	0

We can see that y=-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

Exercise 40 Page 57

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