<h2>Answer:</h2><h2>R=2</h2><h2 /><h2>Explanation:</h2><h2>x
=
4 is a vertical line parallel to the y-axis and passing
</h2><h2>
through all points in the plane with an x-coordinate of 4
</h2><h2>
x
=
2 is parallel to x
=
4 so is a vertical line
</h2><h2>
passing through all points with x-coordinate of 2
</h2><h2>
plot 2 or 3 points with an x-coordinate of 2 and draw a straight line through them
</h2><h2>
for example </h2><h2>(
2
,
−
5
)
,
(2
,
0
)
,
(
2
,
3
)
</h2><h2>
graph{(y-1000x+4000)(y-1000x+2000)=0 [-10, 10, -5, 5]}</h2>
