X va y ni yechish uchun siz almashtirish usulidan foydalanishingiz mumkin. Avval, tenglamalardan birida x yoki y ni ajratib oling va ifoda boshqa tenglamada o'rnini bosing. Keyin, qolgan o'zgaruvchini yeching va boshqa o'zgaruvchini topish uchun ifoda ishlating. Keling, birinchi tenglamada y ni ajratib olamiz: x + y = 18 y = 18 - x Endi, y = 18 - x ni ikkinchi tenglamada o'rnini bosing: 5x + 9y = 122 5x + 9 ((18 - x) = 122 5x + 162 - 9x = 122 -4x = -40 x = 10 Endi biz x ni topdik, y = 18 - x ni topish uchun y = 18 - y = 18 - 10 y = 8 ifoda ishlatishimiz mumkin. Demak, tenglamalar tizimining yechimi x = 10 va y =
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