-3u=15 What is the value of u
Is it 5?
Close. Let's see where you went wrong though.
-3u=15
divide by -3
-3 -3
u=-5
So the answer is -5. Good try though!
-3u = +15
Find the value of u.
The value of u is -5. A negative multiplied by a negative is a positive. If the answer was -15, then the value of u would be +5, since a negative multiplied by a positive (vice versa) equals to a negative.
Hopefully that helps.