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aleksandr82 [10.1K]
3 years ago
12

Trevor solved the system of equations below. What mistake did he make in his work?

Mathematics
1 answer:
storchak [24]3 years ago
3 0
The answer is <span>He subtracted 10 from the right side instead of adding 10 to the right side

Let's solve it:
</span><span>2x + y = 5
x − 2y = 10
________
Rearrange first equation to get y:
y = 5 - 2x
________
Substitute y into the second equation:
x - 2(5 - 2x) = 10
________
Multiply the terms:
x - 10 + 4x = 10
________
Combine the terms:
5x - 10 = 10
________
Add 10 on the both sides of the equation:
5x = 10 + 10
5x = 20
x = 4</span>
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Answer:

b=15

How I got it:

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Checking:

15 - 7 = 8

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<em>You can tell b = 15 is the correct answer.</em>

3 0
3 years ago
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3 years ago
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Fofino [41]

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One solution was found :

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Rearrange:

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Step by step solution :

Step  1  :

Equation at the end of step  1  :

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Step  2  :

Step  3  :

Pulling out like terms :

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Equation at the end of step  3  :

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Step  4  :

Equations which are never true :

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Hope this helps you, Have a nice day.

4 0
3 years ago
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sweet [91]
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7 0
3 years ago
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Answer:

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sqrt(150)

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8 0
3 years ago
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