<PRE><B>Question 188896</B>
lets call our sides a, b ,and c.....so we have P=39..and we have a=2b+3 and c=2b-4.......find longest side
:
P=a+b+c..........eq 1
a=2b+3...........eq 2
c=2b-4...........eq 3
P=39.............eq 4
:
lets plug the values of a from eq 2 , c from eq 3 ,and P from eq 4 into eq 1
:
39=2b+3+b+2b-4
:
5b=40
:
b=8
:
a=2(8)+3=19
:
c=2(8)-4=12
:
longest side is a=19</PRE>