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3 years ago

9

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

1 answer:

wariber [46]3 years ago

7 0

2x + y = 5

x − 2y = 10

y = 5 − 2x

x − 2(5 − 2x) = 10

x − 10 + 4x = 10

5x − 10 = 10

<em>add 10 to each side</em>

<em>5x-10+10 = 10 + 10</em>

<em>5x=20</em>

5x = 0 <em>this is the error</em>

He needs to add 10 to each side

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