SOLUTION: Write the equation of variation . The cost of a train ticket varies directly with the number of kilometers travelled. Ifa ticket for a 140-kilometers trip cost php 84, how mmuch w

Question 914334: Write the equation of variation .
The cost of a train ticket varies directly with the number of kilometers travelled. Ifa ticket for a 140-kilometers trip cost php 84, how mmuch would a 320-kilometer trip cost?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Let p be constant of proportionality (meaning in this case, price)
let c be cost of a trip
let d be distance of a trip

The direct variation description gives , for c varies directly with d.

Now, your values given are supposed to mean, , which allows you to find p.

, Php per kilometer

The more specific equation is now .
If d=320, then Php.

Problem question written more clearly than your other posting.
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