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February 1, 2015

February 1, 2015

Posted by **snow** on Friday, March 14, 2014 at 1:11pm.

Answers are

C =1.44 d +4.40

C=1.10 c +4.40

C=1.29 d+1.70

C=1.10 d +1.70

Thanks

- algebra -
**Steve**, Friday, March 14, 2014 at 1:17pmIf the formula is c=ad+b, then

5a + b = 7.20

9a + b = 11.60

Solve for a and b.

Or, note that as the distance increased by 4, the cost increased by 4.40

So, the slope is 1.1

That eliminates two of the choices right away. Now just see how much extra there is in each case when multiplying the distance by 1.1

- algebra -
**snow**, Friday, March 14, 2014 at 3:36pmWould the answers be c=1.10c+4.40

- algebra -
**Steve**, Friday, March 14, 2014 at 4:19pmummm. No

1.1(5) = 5.5

5.5+1.7 = 7.2

c = 1.1d + 1.7

Did you even try your formula against the data?

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