[13.1] Sketching vector fields

Sketch each of the following vector fields.

$\myv F(x,y)=2\,\uv i+3\,\uv j$	$\myv F(x,y)=x\,\uv i$
$\myv F(x,y)=2\,\uv i+x\,\uv j$	$\myv F(x,y)=-x\,\uv j$

$\myv F(x,y)=xy\,\uv i+0\,\uv j$	$\myv F(x,y)=y\,\uv i-x\,\uv j$
$\myv F(x,y)=x\,\uv i+y\,\uv j$	$\myv F(x,y)=2\,\uv i$