Respuesta :
Lets label each side first:
r = 1st side
s= 2nd side
t= 3rd side
Now lets find the equations to each:
s - 4 = r
r +3 = t
r+s+t = 15
It wants to know which equation would represent the third side "t" . We can find the equation that solves for it ; in other words the equation that has "t" isolated and that is the second equation. We can sub in the first one into it:
s - 4 = r
r +3 = t
plug the first one into the second one by substituting the r, we should get:
(s-4)+3=t .... s-1=t or "s -1"
Answer with Step-by-step explanation:
Let s represents the length of the second side of the triangle.
The first side of a triangle measures 4 in. less than the second side
i.e. length of first side= s-4
The third side is 3 in. more than the first side
i.e. length of third side= s-4+3
= s-1
The perimeter is 15 in
i.e. s-4+s+s-1=15
i.e. 3s-5=15
i.e. 3s=20
i.e. s=6.66
Length of third side= s-1
= 6.66-1
= 5.66
Hence, Length of third side= 5.66 in.
and it is represented by s-1
