a(x, y) = (7 * x) + (13 * y)  <  10
b(x, y) = (12 * x) + (5 * y) ≥ 10
c(x, y) = x + (19 * y) ≥ 10
d(x, y) = (9 * x) + (13 * y)  <  10
e(x, y) = (7 * x) + (9 * y) ≥ 10
f(x, y) = (6 * x) + (19 * y)  <  10
A = (0.6, 0.47)