SOLUTION: Find the value of the variable that is not given.P=a+b+c (perimeter of a triangle); P=12, a=3,c=5. The answer was b=4 but i was not sure how to get to that answer or how to solve i

Algebra ->  Formulas -> SOLUTION: Find the value of the variable that is not given.P=a+b+c (perimeter of a triangle); P=12, a=3,c=5. The answer was b=4 but i was not sure how to get to that answer or how to solve i      Log On


   

Question 254977: Find the value of the variable that is not given.P=a+b+c (perimeter of a triangle); P=12, a=3,c=5. The answer was b=4 but i was not sure how to get to that answer or how to solve it.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
P=a+b+c
12=3+b+5
subtract 3 from both sides
then subtract 5 from both sides
that is b