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3 years ago

Please help thank you

Mathematics

1 answer:

kifflom [539]3 years ago

7 0

I believe A is the answer hope this helps lol lmk if it’s correct:)

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Step-by-step explanation:

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① 5J+2S =12.20 ② 5J+ 10S =15.80 elimination method

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Answer:

Step-by-step explanation:

$5J +2S =12.20 ........(1)\\5J+10S=15.80......(2)\\Multiply \:equation \:(1)\:by\:the\:coefficient\:of\:x\:in equation\:(2)\\\\Multiply\:equation(2)\: by\: the\: coefficient\:of \:x\: in \:equation (1)\\\\5J +2S =12.20 ........(1) \times 5\\5J+10S=15.80......(2)\times 5\\\\25J+10S=61......(3)\\25J+50S = 79......(4)\\Subtract\:equation\:(4)\:from\: equation\: (3)\\-40S =-18\\\frac{-40S}{-40}=\frac{-18}{-40}\\ S = 9/20\\$

$Substitute \:9/20\:for \:x \:in\:equation\:(1)\:or \:equation\:(2)\\5J+2S = 12.20\\5J +2(9/20) =12.20\\5J +9/10=12.20\\5J=12.20-9/10\\5J=113/10\\Cross-Multiply\\50J = 113\\J = 113/50$

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4 years ago

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Step-by-step explanation:

In this question, we have to find the operation which is equivalent to adding a number to itself.

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Step-by-step explanation:

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