ГДЗ по алгебре 9 класс Макарычев Задание 43

\[\boxed{\text{43\ (43).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[\textbf{а)}\ 1) - 0,7x + 350 = 0\]

\[0,7x = 350\]

\[x = 500\]

\[y = 0\ \ \ при\ \ \ x = 500.\]

\[2) - 0,7x + 350 > 0\]

\[0,7x < 350\]

\[x < 500\]

\[y > 0\ \ при\ \ \ x < 500.\]

\[3) - 0,7x + 350 < 0\]

\[0,7x > 350\]

\[x > 500\]

\[y < 0\ \ \ при\ \ \ x > 500.\]

\[\textbf{б)}\ 1)\ 30x + 10 = 0\]

\[30x = - 10\]

\[x = - \frac{1}{3}\]

\[2)\ 30x + 10 > 0\]

\[30x > - 10\]

\[x > - \frac{1}{3}\]

\[3)\ 30x + 10 < 0\]

\[30x < - 10\]

\[x < - \frac{1}{3}.\]