Algebradan yordam berila iltimos


Algebradan yordam berila iltimos

12рок1 12рок1    1   08.09.2021 15:12    0

Ответы
ЮляЯяя1111 ЮляЯяя1111  25.11.2021 16:17

№4

1)

7x + 4y = 29 \\ 5x + 2y = 19

Keyin birinchi tenglama bilan ikkinchi tenglamani ayiramiz. Ya’ni :

2x + 2y = 10

Tenglamani ikkiga bõlamiz |÷2

x + y = 5 \\ x = 5 - y

"x" õrniga «5-y»ni qõyamiz.

7(5 - y) + 4y = 29 \\ 35 - 7y + 4y = 29 \\ - 3y = - 6 \\ y = 2

Endi X ni topamiz.

X = 5 - y. => X = 5 - 2 = 3

Javob: X = 3; Y = 2.

2)

5x - 4y = 13 \\ 2x - y = 4

5x - 4y = 13 \\ y = 2x - 4

5x - 4(2x - 4) = 13 \\ 5x - 8x + 16 = 13 \\ - 3x = - 3 \\ x = 1

y = 2x - 4 \\ y = 2 \times 1 - 4 \\ y = - 2

Javob: X = 1; Y = -2
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