Round your answer to the nearest tenth
Find the perimeter of the triangle below

Hello : 
let : y  The length   and x the width   the perimeter is : 2(x+y)
The length of a rectangle is one more than five times its width: y = x +5
the system is:  2(x+y) = 38(1)
                         y = x + 5(2)
subst in (1) : 2(x+x+5) = 38
                     4x+10 = 38
 4x =28 x = 7
but: y = x +5
y = 7+5 = 12