Biz bir vaqtning o'zida tenglamalarni almashtirish usuli yoki yo'q qilish usuli yordamida yechamiz. bu yerda men almashtirish usulidan foydalanaman. bizda tenglamalar bor: 1. x + y = 100 2. 1500x + 2000y = 220000 avval tenglamadan bir o'zgaruvchini chiqaramiz. men x ni tenglamadan chiqaram: 1. x = 100 - va endi biz x ning ifodasini tenglamadan almashtiramiz: 2. 150000 - 100 - y) + 2000y = 220000 kengayib soddalashtiramiz: 150000 - 1500y + 2000y = 220000 shunga o'xshash atamalarni birlashtiramiz: 500y = 70000 500 ni 500 ga bo'laylik: y = 70000/500 y = 140 Endi bizda y ning qiymati bor, biz uni x ning ifodasiga almashtiramiz: x = 100 - y = 100 - x
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