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3 years ago

(2x+5y-z)+(-6x-4y+7z)

Mathematics

1 answer:

11111nata11111 [884]3 years ago

8 0

Answer:

-4x + y + 6z

Step-by-step explanation:

2x + 5y - z + (-6x - 4y + 7z) < distribute positive 1 to (-6x - 4y + 7z)

2x + 5y - z - 6x - 4y + 7z < combine like terms to get the answer

2x - 6x = -4x

5y - 4y = y

-z + 7z = 6z

our new expression is:

-4x + y + 6z we cannot simplify this any further, so this is our answer

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First, multiply the first equation by 2.

That turns the first equation into:

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That way it can easily be added to the second equation:

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As you can see, the y disappeared, which was the objective of this operation.

Now the equations can be solved easily:

7x = 21
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Insert x=3 in the original equation:

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Tatiana [17]

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AleksandrR [38]

Answer:

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