Question 408351
A square platform has a perimeter which is 9 times the length of a side, decreased by 15.
 Find the length of a side.
:
Let s = the length of a side
4s = 9s - 15
+15 = 9s - 4s
15 = 5s
s = {{{15/5}}}
s = 3 units
;
:
Check this
4(3) = 9(3) - 15
12 = 27 - 15