\[\boxed{\text{963\ (963).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = kx + b \Longrightarrow уравнение\ \]
\[прямой.\]
\[\textbf{а)}\ x_{1} = 0,\ \ y_{1} = 30,\]
\[x_{2} = 6,\ \ y_{2} = 0,\]
\[\textbf{б)}\ x_{1} = 2,\ \ y_{1} = 3,\]
\[x_{2} = - 2,\ \ y_{2} = 10,\]