The cost of 5 similar digital cameras and 3 similar video cameras is 3213. Each video camera costs 4 times as much as each digital camera. John buys a digital camera and a video camera. How much does he

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asked Mar 1, 2014 25.1k views

5 votes

Mathematics
middle-school

Ovidiu Ionut asked

by Ovidiu Ionut

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2 Answers

3 votes

Answer:

945

Explanation:

Sigurd Mazanti answered Mar 2, 2014

by Sigurd Mazanti

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5 votes

$x\ -\ cost\ of\ digital\ camera\\y\ -\ cost\ of\ video\ camera\\5x+3y=3213\\y=4x\\5x+3\cdot4x=3213\\17x=3213/:17\\x=189\\y=4\cdot189\\y=756\\\\189+756=945$
Answer: John pays 945 for a digital camera with a video camera.

I hope I helped :D

Janjust answered Mar 5, 2014

by Janjust

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