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JulijaS [17]
3 years ago
5

Let x=number of cds and y=number of dvds

Mathematics
1 answer:
Elis [28]3 years ago
6 0
X + y = 40.....multiply by -4
4x + 6y = 180
-------------------
-4x - 4y = -160 (result of multiplying by -4)
4x + 6y = 180
------------------add
2y = 20
y = 20/2
y = 10 <===

x = 30

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<u>Divide</u>

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As you can see we still get 1/3 when we divide by 3. Even tho you have to divide twice you still get 1/3. That's all that matters.

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