Question

How do you graph the equation `y=-x`?

Answer 1

Work out points and plot them on a grid.

Explanation:

The basic way to draw a graph is to plot points.

To find points, choose different `x` values and then work out the matching `y` values.

In this case, the `y` values will be the negative of what `x` is, so just change the sign of `x`.

Examples would be:
`(5,-5), (8, -8), (0,0), (-4, 4), (-7, 7)` and so on.

Plot these points on a grid and join them with a straight line.
The result is shown below:

graph{y=-x [-20, 20, -10, 10]}