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?
Answer This Question
Related Questions
 ALGEBRA  A 5mile cab ride costs $9.30. A 11mile cab ride costs $17.70. Find a...
 algebra 2  A 2mi cab ride costs $1.70. A 7mi cab ride costs $3.70. Find a ...
 Math  A 3mi cab ride costs $4.50. A 7min cab ride costs $8.10. Find a linear ...
 algebra  A 3mi cab ride costs $3.00. A 6mi cab ride costs $4.80. Find a ...
 algebra 34  a 3 mile cab ride cost $7.00. A 7 mile cab ride cost $11.50. Find ...
 Math  A 3mile cab ride cost $3.00. A 6mile cab ride cost $4.80. Find a linear...
 help  a 2mi cab ride costs $4.25. a 7mi cab ride costs $8.50. which equation ...
 Algebra  A 2 mile cab cost $5. A 6 mile cab costs $9. Write an equation to ...
 algerbra  A ride in a cab costs $0.40 plus $0.15 per mile. a.Write an equation ...
 Math  An average cab ride is 7.3 miles. The cost is $3 for the first mile and $...
More Related Questions