Answer
$ a.\quad$Intercepts: $(-4,0)$ , $(0,3)$
$b.$
Work Step by Step
$ \begin{array}{ll}
\text{x-intercept} & \text{y-intercept}\\
(y=0) & (x=0)\\
& \\
-0.3x+0.4(0)=1.2 & -0.3(0)+0.4y=1.2\\
-0.3x=1.2 & 0.4y=1.2\\
x=-4 & y=3\\
& \\
(-4,0) & (0,3)
\end{array}$
Draw a line through the two points.