Find the perimeter of ABHG

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

Find the value of x. give reasons to justify your solutions! l, m ∈ kn