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

A 5mile cab ride costs$7.20 a 9 mile cab ride costs $11.60 find a linear equation that models a relationship between cost c and distance d?

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 1:17pm
If 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 3:36pm
Would the answers be c=1.10c+4.40

- algebra -
**Steve**, Friday, March 14, 2014 at 4:19pm
ummm. 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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