# algebra

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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?
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 -

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 -

• algebra -

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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