Determine whether each of the following is an interior point solution to the standard-form LP constraints 4x1 + 1x3 = 13 5x1 + 5x2 = 15 x1, x2, x3 Ú 0

(a) x = 13, 0, 12

(b) x = 12, 1, 52

(c) x = 11, 2, 92

(d) x = 15, 1, 12

(e) x = 12, 2, 12

(f) x = 10, 3, 132