Question

Two rolls of films plus 4 batteries cost $13.60 while 5 rolls of film plus 6 batteries cost$30.80. Find the cost of 1 roll of film and 1 battery.

Answer 1

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Step-by-step explanation:

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Answer 2

Taking Film roll as x ( not the no of Film roll)

Taking batteries as y ( not no of batteries)

According to the question

2x + 4y = $13.6

2(x + 2y) = $13.6

x + 2y = $6.8

5x + 6y = $30.8

5x + 6y - (x + 2y) = $30.8

5x - x + 6y - 2y = $ (30.8 - 6.8)

4x + 4y = $ 24

4(x+y) = $ 24

x + y = $ 6