Answer
The ordered pairs $(0,3)$ and $(2,-1)$ are not solutions.
Work Step by Step
We replace $x$ with $0$ and $y$ with $3$ and see if a true statement results.
$x-y \gt 3$
$(0)-(3) \gt 3$
$0-3 \gt 3$
$-3 \gt 3$ False
The ordered pair $(0,3)$ is not a solution since $-3 \gt 3$ is a false statement.
We replace $x$ with $2$ and $y$ with $-1$ and see if a true statement results.
$x-y \gt 3$
$(2)-(-1) \gt 3$
$2+1 \gt 3$
$3 \gt 3$ False
The ordered pair $(2,-1)$ is not a solution since $3 \gt 3$ is a false statement.