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jenyasd209 [6]
3 years ago
12

The cost of three notebooks and four pencils is $8.50. The cost of five notebooks and eight pencils is $14.50. Determine the cos

t of one notebook and the notebook and the cost of one pencil. (Only algebraic solution)
Mathematics
1 answer:
ludmilkaskok [199]3 years ago
5 0

3n +4p = 8.5

5n + 8p=14.5

 

multiple 1st equation by -2 and add the equations together to solve for n

-6n-8p=-17

5n +8p=14.5

-1n = -2.5

n=2.5

 

and sub 'n' into an equation:

3(2.5) +4p =8.5

7.5 +4p = 8.5

4p = 1

p = .25

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The sum of twelve and a number is no greater than sum of twice the number and -8
Leona [35]
1. Write as an algebraic equation:

12 + n ≤ 2n - 8

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12 + n - 12 ≤ 2n - 8 - 12

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Multiply both sides by -1 (this means you must flip the inequality sign).

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Hope this helps! Feel free to ask for clarification.
7 0
3 years ago
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yanalaym [24]

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