SOLUTION: I had the problem 18 - n = 21 and I found the answer doing this:
18 - n = 21
18 - n - 18 = 21 - 18
-n = 3
-1(-n) = -1(3)
n = -3
The thing I'm struggling with is justifying th
Algebra ->
Distributive-associative-commutative-properties
-> SOLUTION: I had the problem 18 - n = 21 and I found the answer doing this:
18 - n = 21
18 - n - 18 = 21 - 18
-n = 3
-1(-n) = -1(3)
n = -3
The thing I'm struggling with is justifying th
Log On
Question 682728: I had the problem 18 - n = 21 and I found the answer doing this:
18 - n = 21
18 - n - 18 = 21 - 18
-n = 3
-1(-n) = -1(3)
n = -3
The thing I'm struggling with is justifying the steps like is that step distributive, associative, commutative etc.?
Thanks! Answer by lynnlo(4176) (Show Source):
(