Can someone just give me the answer?

Carlos 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

A) He should have substituted 5 + 2x

B) He did not distribute correctly

C) He combined like terms incorrectly, it should have been 4x instead of 5x

D) He made no mistake

Question

Can someone just give me the answer?

Carlos 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

A) He should have substituted 5 + 2x

B) He did not distribute correctly

C) He combined like terms incorrectly, it should have been 4x instead of 5x

D) He made no mistake

uri · Answer

$\huge\sf Hey,~you~want~Ansurs?$

irishboy123 · Answer

you gotta follow this yourself.  i think that is the point of a question like this.  i can clue you - 2 minuses make a plus when you multiply.  the mistake is there and it is far from a needle in a haystack.  good luck!

anonymous · Answer

So he didn't distribute correctly?

irishboy123 · Answer

i think that by a process of elimination that must be the correct and logical solution.  well done you.

anonymous · Answer

Thanks!