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ziro4ka [17]
4 years ago
8

chris wants to order dvds over the internet each dvd costs $15.99 and shipping the entire order costs $9.99 if he can spend no m

ore then $100 how many dvds could he buy?
Mathematics
1 answer:
Aleks [24]4 years ago
5 0

5 would cost $80 and shiping is $10 so he can only buy 5

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Answer:

The\: value \:of\: the\: first\: number\:is\:9

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We\:have\:a\:system\:of\:equation:\\\left \{ {{x+y=39} \atop {3x+3=y}} \right. \\\Leftrightarrow \left \{ {{39-x=y} \atop {3x+3=39-x}} \right. \\\Leftrightarrow \left \{ {{39-x=y} \atop {4x=36}} \right. \\\Leftrightarrow \left \{ {{y=39-9} \atop {x=9}} \right. \\\Leftrightarrow \left \{ {{y=30} \atop {x=9}} \right. \\\Rightarrow x=9

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