Now we will create a graph with two curves and three axes. First, let's read the following vectors of data:

x <- c(-25:25)y <- 1.5*x + 2z <- 0.3*(x**2) - 20

In the preceding code, we have a linear function and a quadratic function. As you will see, we will need some extra room for text on the right-hand margin. This is because we wish to add some explanatory text there. By default, graphs in R have margins that are as follows:

- 5-lines wide on the bottom axis
- 4-lines wide on the left-hand axis
- 4-lines wide on the top axis
- 2-lines wide on the right-hand axis

We want to create a right-hand margin 8.1-lines wide on the right axis using the `mar`

argument, which controls margin widths:

**par(mar=c(5, 4, 4, 8) + 0.1)**

Note the ...

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