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Trevor solved the system of equations below. What mistake did he make in his work?
2x + y = 5
x − 2y = 10
y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
5x = 0
x = 0
2(0) + y = 5
y = 5
He should have substituted 5 + 2x
He combined like terms incorrectly, it should have been 4x instead of 5x
He subtracted 10 from the right side instead of adding 10 to the right side
He made no mistake
 one year ago
 one year ago
Trevor solved the system of equations below. What mistake did he make in his work? 2x + y = 5 x − 2y = 10 y = 5 − 2x x − 2(5 − 2x) = 10 x − 10 + 4x = 10 5x − 10 = 10 5x = 0 x = 0 2(0) + y = 5 y = 5 He should have substituted 5 + 2x He combined like terms incorrectly, it should have been 4x instead of 5x He subtracted 10 from the right side instead of adding 10 to the right side He made no mistake
 one year ago
 one year ago

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azolotorBest ResponseYou've already chosen the best response.1
He made no mistakes. Follow through his work and do it yourself and you will find that those answer are correct. You could also plug the values in for x and y and see if they check out.
 one year ago

phiBest ResponseYou've already chosen the best response.1
5x − 10 = 10 5x = 0 Do you see anything wrong with this step? I do.
 one year ago

SolmyrBest ResponseYou've already chosen the best response.0
i do see that i didnt see that before
 one year ago

phiBest ResponseYou've already chosen the best response.1
what happens if you add +10 to both sides? Like this: 5x − 10 +10 = 10+10
 one year ago

azolotorBest ResponseYou've already chosen the best response.1
Sorry, he is right. I should have been wearing my glasses.
 one year ago

phiBest ResponseYou've already chosen the best response.1
do you see that 10 +10 is 0 ? 5x − 10 +10 = 10+10 becomes 5x = 10+10
 one year ago

phiBest ResponseYou've already chosen the best response.1
and 10+10 is 20 so you get 5x=20 which does not match what Tevor did in the problem
 one year ago

SolmyrBest ResponseYou've already chosen the best response.0
srrry was afk so its C?
 one year ago
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