# how to plot vertical lines

how do I plot a vertical line such as x = 3, together with another graph, such as y = x^3?

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how to plot vertical lines

**
asked 2017-08-23 19:26:39 +0200 **

Anonymous

how do I plot a vertical line such as x = 3, together with another graph, such as y = x^3?

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2

If `P`

and `Q`

are plots then you may display them together via `P+Q`

.

For the vertical line you may use `implicit_plot`

or just draw it
manually via `line`

.

```
var('x,y')
# plot line x=3
P = implicit_plot(x==3,(x,2,4),(y,-1,5))
# manualy draw line x=5
Q = line([(5,-1),(5,5)])
# display P and Q together.
(P+Q).show()
```

Guess plotting `y=x^3`

can be left as an exercise ;-)

Hint.

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Asked: ** 2017-08-23 19:26:39 +0200 **

Seen: **2,380 times**

Last updated: **Aug 23 '17**

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