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vovangra [49]
2 years ago
8

10x – 5y + 2x – Зу Simplify this expression

Mathematics
2 answers:
iVinArrow [24]2 years ago
7 0
12x - 8y or 4(3x-2y)

Add 10x and 2x and -5y and -3y
12345 [234]2 years ago
4 0

Answer:

12x-8y

Step-by-step explanation:

add 10x and 2x, this gets 12x, and add -5y with -3y, which gives you -8y. Add both of these values together and you get 12x-8y

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Step-by-step explanation:

The question asks for the total cost of a notebook and pen together. We don't need to find their individual costs in order to answer the question.

Sometimes we get bored solving systems of equations in the usual ways. For this question, let's try this.

The first equation has one more notebook than pens. The second equation has 4 more notebooks than pens. If we subtract 4 times the first equation from the second, we should have equal numbers of notebooks and pens.

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__

<em>Additional comment</em>

The first equation has 1 more notebook than 2 (n+p) combinations, telling us that a notebook costs $6.50 -2(2.50) = $1.50. Then the pen is $2.50 -1.50 = $1.00.

One could solve for the costs of a notebook (n) and a pen (p) individually, then add them together to answer the question. We judge that to be more work.

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