SOLUTION: I'm doing my math homework, and there is one question I do not know how to solve. How do you solve: -4=2/5a

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Question 492117: I'm doing my math homework, and there is one question I do not know how to solve. How do you solve:
-4=2/5a
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
-4 = 2/5a

multiply both sides of the equation by a to get:

-4a = 2/5

divide both sides of the equation by -4 to get:

a = -2/20 = -1/10

replace a in your original equation to get:

-4 = 2/5*(-1/10) which becomes:

-4 = 2/(-5/10) which becomes:

-4 = 2/(-.5) which becomes:

-4 = -4

the value of a = -1/10 is good.

in decimal form, that's a = -.1