Question

даю 25 балів!❗❗❗❗❗❕ допоможіть!​

Answer 1

Ответ:

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Answer 2

Ответ:

$7)\ \ 3x+2y=13\\\\A(2;b)\ \ \Rightarrow \ \ \ x=2\ ,\ \ y=b\\\\3\cdot 2+2b=13\ \ ,\ \ 2b=13-6\ \ ,\ \ 2b=7\ \ ,\ \ \boxed{\ b=3,5\ }\\\\\\8)\ \ 5\dfrac{1}{2}\, x-\dfrac{2}{3}\, y=c\ \ \to \ \ \ \dfrac{11}{2}\, x-\dfrac{2}{3}\, y=c\\\\\\A(-2;3)\ \ \Rightarrow \ \ x=-2\ ,\ \ y=3\\\\\dfrac{11}{2}\cdot (-2)-\dfrac{2}{3}\cdot 3=-11-2=-13\ \ ,\ \ \ \boxed{\ c=-13\ }$

$9)\ \ 6x-5y=11\\\\{}\ \ \ \ 6x=5y+11\ \ ,\ \ \ x=\dfrac{5}{6}\, y+\dfrac{11}{6}\\\\{}\ \ \ \ 5y=6x-11\ \ ,\ \ y=\dfrac{6}{5}\, x-\dfrac{11}{5}\\\\x_0=2\ \ \Rightarrow \ \ y_0=\dfrac{6}{5}\cdot 2-\dfrac{11}{5}=\dfrac{12-11}{5}=\dfrac{1}{5}=0,2\ \ \ \Rightarrow \ \ \ \boxed{\ A(\ 2\ ;\ 0,2\ )\ }$