Given, the plot is in the shape of triangle.
First side = x meter
Second side = ( 5x-3 )meters
Third side = ( 7x-6 ) meters
Perimeter of triangle is equal to the sum of all the three sides.
Perimeter = [tex]x + (5x-3) + (7x-6)[/tex]
Combine like terms by adding all the x terms together and all the constant terms together.
Perimeter = [tex](x+5x+7x) + ( -3 -6 )[/tex]
Perimeter = [tex]13x - 9[/tex] feet ... Answer