а) значение y; если x=-0,5;0;2 1/3;
б) значение x, при котором y=-3;0;20.
\[y = - 6x + 15\]
\[а)\ y;если\ x = - 0,5;0;2\frac{1}{3};\]
\[x = - 0,5:\]
\[y = - 6 \cdot ( - 0,5) + 15 = 3 + 15 = 18.\]
\[x = 0:\]
\[y = - 6 \cdot 0 + 15 = 15.\]
\[x = 2\frac{1}{3} = \frac{7}{3}:\]
\[y = - 6 \cdot \frac{7}{3} + 15 = - 14 + 15 = 1.\]
\[б)\ x,\ при\ котором\ y = - 3;0;20.\]
\[y = - 3:\]
\[- 3 = - 6x + 15\]
\[6x = 15 + 3\]
\[6x = 18\]
\[x = 3.\]
\[y = 0:\]
\[0 = - 6x + 15\]
\[6x = 15\]
\[x = \frac{15}{6} = \frac{5}{2}\]
\[x = 2,5.\]
\[y = 20:\]
\[20 = - 6x + 15\]
\[6x = 15 - 20\]
\[6x = - 5\]
\[x = - \frac{5}{6}.\]