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July 23, 2014

July 23, 2014

Posted by **Lisa** on Sunday, May 23, 2010 at 8:38pm.

how do you determine if a table is linear here is the table I am looking at....

x 2 5 7 10 12 20

y -3 0 2 5 7 15

please guide me in the right direction...

- Algebra -
**bobpursley**, Sunday, May 23, 2010 at 8:42pmpick a delta x. Say from 2to 5,or a deltax of 3

Notice the corresponding delta y is -3 to 0, a deltay of 3

slope= deltaty/deltax= 3/3=1

Now try it for other pairs.

- Algebra -
**Lisa**, Sunday, May 23, 2010 at 8:46pm7 to 10 would then be 3 and 2 to 5 is also 3 and then the last would be 12 to 20 would be 8 and 7 to 15 would be 8 so this would be a linear but then how do you write an equation?

- Algebra -
**bobpursley**, Sunday, May 23, 2010 at 8:59pmy= mx+b

you know m as 1.

y= x+b

now put in any x,y pair, and solve for b.

- Algebra -
**Lisa**, Sunday, May 23, 2010 at 9:02pmy=1(3/8)+3?? is that right?

- Algebra -
**Tammy**, Sunday, March 13, 2011 at 12:53amNo. y=x+b

2=7+b

7-2=b I think you can get it from here :)

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