SOLUTION: Solve using substitution method
For 2000 dollars are bought 15 notebooks and 12 markers. How much does 1 notebook and much does 1 marker cost, if 3 markers cost as much as 6 noteb
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Question 1095810: Solve using substitution method
For 2000 dollars are bought 15 notebooks and 12 markers. How much does 1 notebook and much does 1 marker cost, if 3 markers cost as much as 6 notebooks?
solving looks something like
12x+15y=2000
6y=3x
Please explain thoroughly and step by step :)
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the cost of 1 marker
Let = the cost of 1 notebook
----------------------------------
(1)
(2)
--------------------------------
Divide both sides of (2) by
(2)
Substitute (2) into (1)
(1)
(1)
(1)
(1)
Plug this result back into (2)
(2)
(2)
----------------------------
One marker costs 102.56
One notebook costs 51.28
----------------------------
check:
(1)
(1)
(1)
(1)
OK -error due to rounding off
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