Breann solved the system of equations below. What mistake did she make in her work?

2x + y = 5
x − 2y = 10

y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
5x = 20
x = 4

2(4) + y = 5
y = −3

She should have substituted 5 + 2x

She combined like terms incorrectly, it should have been 4x instead of 5x

She subtracted 10 from both sides instead of adding 10 to both sides

She made no mistake

Question

Breann solved the system of equations below. What mistake did she make in her work?

2x + y = 5
x − 2y = 10

y = 5 − 2x
x − 2(5 − 2x) = 10
x − 10 + 4x = 10
5x − 10 = 10
5x = 20
x = 4

2(4) + y = 5
y = −3 

 She should have substituted 5 + 2x 

 She combined like terms incorrectly, it should have been 4x instead of 5x 

 She subtracted 10 from both sides instead of adding 10 to both sides 

 She made no mistake

anonymous · Answer

I am pretty sure she made no mistake, lol! :D

anonymous · Answer

Does anyone know?

anonymous · Answer

... weird

anonymous · Answer

i dont see any mistakes

anonymous · Answer

she showed no working, maybe?

anonymous · Answer

Me either, Idon't know if that is the answer though. :)

anonymous · Answer

id just go with "d"

anonymous · Answer

This is the multiple choice, lol!...

 She should have substituted 5 + 2x 

 She combined like terms incorrectly, it should have been 4x instead of 5x 

 She subtracted 10 from both sides instead of adding 10 to both sides 

 She made no mistake

anonymous · Answer

wait she did... this is more confusing than ODE

anonymous · Answer

Me too, but I want to make sure it is right though. :)

anonymous · Answer

OHHHHHH she made no mistake then

anonymous · Answer

...

you can always check your answers, by substituting both x and y into the 2 given equations

if the equations are both true, then there is no mistakes in teh work

anonymous · Answer

Ok,t hx lol! I will. :)