Question

What value of k makes the equation true?

12 + (–17) = –17 + k

k =

Answer 1

12 because of commutative property of addition.

Answer 2

12=-17+17+k
12=k
k=-12
(negative 17 canceled out the positive 17)

Answer 3

so?

Answer 4

i just worked out the whole equation for you

Answer 5

oh i get it now ok

Answer 6

Think about it like this,

Both sides have to be equal right?
There's 1 number that is the same on both sides.
There is another 2 numbers on one side and on the other a variable

Well, if A+B=C
Then, B+__=C ?

Answer 7

ok

Answer 8

the answer is 12