Jimmy is a carpenter. The graph shows the number of chairs that he assembles and the amount of time it takes him.

https://cdn.app.edmentum.com/EdAssets/3e6b5ceb5d69473391922c6099ffbd7d?ts=635707148368100000

The equation that relates the number of chairs he assembles, c, and the number of hours he works, h, is c = h.
If he spends 4.5 hours assembling chairs, the number of chairs he assembles is .