a=21-4n need help fast

Question

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Answer 1

a=21-4n

If you are solving for "n," then you want it to be positive, so add +4n to both sides of equal sign.

 

a+4n=21+4n-4n        Simplify the equation.

 

a+4n=21                 "a" is in the way, so subtract it from both sides of equation.

 

a-a +4n=21-a           Simplify the equation.

 

4n=21-a                  Now, you are solving for "n," so divide every term by the number next to "n."  Then you are done.

 

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                                            Susan C.