Функция задана формулой y=3x-9. Найдите:

а) значение y, если x=-1/3;0;4,5;

б) значение x, при котором y=-3;0;6.

\[y = 3x - 9\]

\[а)\ y,\ если\ x = - \frac{1}{3};0;4,5;\]

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

\[y = 3 \cdot \left( - \frac{1}{3} \right) - 9 = - 1 - 9 = - 10.\]

\[x = 0:\]

\[y = 3 \cdot 0 - 9 = - 9.\]

\[x = 4,5:\]

\[y = 3 \cdot 4,5 - 9 = 13,5 - 9 = 4,5.\]

\[б)\ x,\ при\ котором\ y = - 3;0;6.\]

\[y = - 3:\]

\[- 3 = 3x - 9\]

\[3x = - 3 + 9\]

\[3x = 6\]

\[x = 2.\]

\[y = 0:\]

\[0 = 3x - 9\]

\[3x = 9\]

\[x = 3.\]

\[y = 6:\]

\[6 = 3x - 9\]

\[3x = 6 + 9\]

\[3x = 15\]

\[x = 5.\]