Answer
See the graph
Work Step by Step
We are given $x + 3y \lt 15$
Graph $x+3y=15$ using a dashed line. Use $(0, 0)$ as a test point.
$x + 3y \lt 15$
$0 + 3(0) \lt 15$
$0 \lt 15$
Shade below the line that contains $(0, 0)$.
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