Answer:
w = 11
l = 42
Explanation:
in word problems :
'more than' means +
'triple' means 3 times
'is' means =
perimeter means 2 times width plus 2 times the length
'length of a rectangle is nine more than triple the
width' means :
l = 9+3w
'perimeter is 106 inches' means
2l + 2w = 106
divide by 2
l + w = 53
substitute l with 9+3w to get the width
9+3w + w = 53
9 + 4w = 53
4w = 44
w = 11
go back to the perimeter equation
l + w = 53
put 11 for w
l + 11 = 53
l = 42