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weqwewe [10]
3 years ago
8

Three pens and two notebooks cost 8.25. two pens and three notebooks cost $8.00. how much would two pens and two notebooks cost?

Mathematics
1 answer:
goblinko [34]3 years ago
6 0
3p + 2n = 8.25 ....multiply by 2
2p + 3n = 8 .........multiply by -3
-------------------
6p + 4n = 16.5 (result of multiplying by 2)
-6p - 9n = - 24 (result of multiplying by -3)
-------------------add
-5n = - 7.5
n = -7.5 / -5
n = 1.50 .............notebooks cost 1.50 each

2p + 3n = 8
2p + 3(1.50) = 8
2p + 4.50 = 8
2p = 8 - 4.50
2p = 3.50
p = 3.50/2
p = 1.75......pens cost 1.75 each

so 2 pens and 2 notebooks cost : 2(1.75) + 2(1.50) = $ 6.50 <==
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Step-by-step explanation:

give endpoints (x₁, y₁ ( and (x₂, y₂ )  then the midpoint is

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here (x₁, y₁ ) = K (9, - 7 ) and (x₂, y₂ ) = L (x, y )

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9 + x = 10 ( subtract 9 from both sides )

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and

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<h3>How to calculate the value?</h3>

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<u>Solution:</u>

The solution of the expression can be determined by solving the expression for t.

Let us solve the given expression.

Applying the log rule, if \log _{b}(f(x))=\log _{b}(g(x)) then f(x)=g(x)

Thus, we have;

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