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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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3 years ago
Stephen factored x2−10x 21 and found the answer to be (x 7)(x 3). Is he correct? Question 4 options: yes no.
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The true statement is that Stephen's factored expression is incorrect.

Given

The expression is given as:

\rm x^2-10x+21

<h3>What is factorization?</h3>

Factorization involves splitting a function into factors.

Start by expanding the equation

\rm x^2-10x+21=0\\\\x^2-7x-3x+21=0

Factorize the equation

\rm x^2-7x-3x+21=0\\\\x(x-7)-3(x-7)=0

Factor out x - 7

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Hence, the true statement is that Stephen's factored expression is incorrect.

Read more about factored expressions at:

brainly.com/question/11579257

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