D(x, y)

LD1

7.5x + 7.5y + 100

LD2

10x + 5y + 100

LD3

(100/7)x + (5/7)y + 100

LD4

(10/3)x + (5/3)y + 600

LD5

2.5x + 2.5y + 600

LD6

(100/21)x + (5/21)y + 600

NLD1

(9/80)x² + (9/80)y² + 100

NLD2

(3/1.6 × 10⁵)x⁴ + (3/1.6 × 10⁵)y⁴ + 100