How do you solve # 3.2 = -0.4n#?

1 Answer
Apr 12, 2018

#n=-8#

Explanation:

To find the value of #n#, divide both sides by #-0.4#. Then you have #3.2/(-0.4)=(-0.4n)/(-0.4)#, and since #(-0.4)/-0.4=1#,

#3.2/(-0.4)=(-0.4n)/(-0.4)# simplifies to

#3.2/(-0.4)=(-0.4n)/(-0.4)#, and finally,

#-8=n#

If you're having trouble figuring out what operation to use to find the value of a variable, think about what the opposite operation of the one you need to "undo" is. Like here, #n# is multiplied by #-0.4#, so we have to divide to get the variable by itself.
Hope this helps, and happy mathing!