[R] Setting graphical parameters

[Pitmaster]

Hi guys... I have problem with this excersise... 

Consider the pressure data frame again.

(a) Plot pressure against temperature, and use the following
command to pass a curve through these data:

> curve((0.168 + 0.007*x)ˆ(20/3), from=0, to=400, add=TRUE)

(b) Now, apply the power transformation y3/20 to the pressure data values.
Plot these transformed values against temperature. Is a linear
or nonlinear relationship evident now? Use the abline() function
to pass a straight line through the points. (You need an intercept
and slope for this – see the previous part of this question to obtain
appropriate values.)

(c) Add a suitable title to the graph.

(d) Re-do the above plots, but use the mfrow() function to display
them in a 2 × 1 layout on the graphics page. Repeat once again
using a 1 × 2 layout.

DATA:
> pressure
   temperature pressure
1            0   0.0002
2           20   0.0012
3           40   0.0060
4           60   0.0300
5           80   0.0900
6          100   0.2700
7          120   0.7500
8          140   1.8500
9          160   4.2000
10         180   8.8000
11         200  17.3000
12         220  32.1000
13         240  57.0000
14         260  96.0000
15         280 157.0000
16         300 247.0000
17         320 376.0000
18         340 558.0000
19         360 806.0000


Can anyone know the solution ?
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