x = 128, y = 284

x = 128, y = 76

x = 64, y = 52

x = 52, y = 284

70

21

56

35

4 packs of envelopes and 10 packs of stamps

60 packs of envelopes and 60 packs of stamps

2 packs of envelopes and 5 packs of stamps

90 packs of envelopes and 90 packs of stamps

(x+2)(x+6)

(x-2)(x-6)

(x+2)(x-6)

(x-2)(x+6)

30x⁷y⁸

30x¹⁰y⁷

11x⁷y⁸

11x¹⁰y⁷