Answer
See the attached image.
Work Step by Step
Given: $3x+y+2z=6$
$x$-intercept $3x=6$ $\implies$ $x=2$
$y$-intercept $y=6$ $\implies$ $y=6$
$z$-intercept $2z=6$ $\implies$ $z=3$
The graph is depicted as below:
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