Problema Solution
An electronic store will sell five AC adaptors and three rechargeable flashlights for $130, or seven AC adaptors and six rechargeable flashlights for $200. What is the price of a single AC adaptor and a single rechargeable flashlights?
Answer provided by our tutors
let
a = the price of a single AC adapter
f = the price of a single rechargeable flashlights
5 AC adapters and 3 rechargeable flashlights cost $130
5a + 3f = 130
7 AC adapters and 6 rechargeable flashlights cost $200
7a + 6f = 200
by solving the system of equations
5a + 3f = 130
7a + 6f = 200
we find
a = $20
f = $10
click here to see the step by step solution of the system of equations
the price of a single AC adapter is $20 and the price of a single rechargeable flashlights is $10.