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If kallem bought 4 notebooks and 2 pens for 4.00 and sally bought 2 notebooks and 4 pens for 3.50 how much is one notebook?
Wiki User
∙ 13y ago
$0.75. There are two linear equations here:
4n + 2p=4
2n + 4p=3.5
The second equation can be multiplied by 2, giving
4n + 8p=7
If we then subtract the first equation from our new one, we get
6p=3
because the n's cross out. If
6p=3,
then
p=.5,
or p= $0.50. If we now put this back into the original equation, we get
4n + 1=4
Therefore,
4n=3
And to eliminate the coefficient, 4, from n, we divide both sides by 4.
n=3/4
In a decimal, that is
n=.75
or
n=$0.75
Wiki User
∙ 13y ago
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