-6 = 15 + x (CHECK MY ANSWER!) Please :)

Question

helenalunch · Answer

-6 = 15 + x

helenalunch · Answer

so using inverse im subtracting 15 from 15 and -6

helenalunch · Answer

15-15 gives me x
and then -6 minus 15 im getting 9 
therefore 9 = x

sunnnystrong · Answer

Hmm....

|dw:1481563102811:dw|

helenalunch · Answer

This confuses me because the "study problem" we received was
-9 = 19 + x
told to subtract 19 from both 19 and -9
19-19 = x 
- 9 minus 19 gave 10
therefore x = 10

solved by the teacher themselves

wanell · Answer

It's -21

sunnnystrong · Answer

@helenalunch ...
-9-19 does not equal 10

it's -28.

Another way to check and see if your arithmetic is correct is by plugging x into the original equation and seeing if it's correct

helenalunch · Answer

That is literally the problem and answer inside the textbook and the explanation given by the teacher though. This is multiple transformations aswell as using inverse operations.

sunnnystrong · Answer

@wanell ... 
it's 21.

sunnnystrong · Answer

@helenalunch ...
welll it doesn't change the fact that -19-9=-28 & not 10.

Checking your first answer & your work... your subtracting incorrectly.

wanell · Answer

-21 check your answer

sunnnystrong · Answer

@wanell 
ooops copied the problem down wrong but same process.

you should show your work versus giving direct answers.

wanell · Answer

well i could but its a little to late for that

sunnnystrong · Answer

$$-6=15+x$$
*Subtract 15 from both sides
$$-21=x$$