Problem of the Week Problem E A Dividing Point A square has vertices at A(0, 0), B(-9, 12), C(3, 21), and D(12, 9). The line ( passes through A and intersects CD at point T(r, s), splitting the square so that the area of square ABCD is three times the area of AATD. Determine the equation of line C. C(3, 21) T(r, s) B(-9, 12) D(12,9) A(0, 0)