How do I make graph paper on my iPad?

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Also question is, how do I edit a graph in pages on iPad?

Modify chart data in Pages on iPad

1. Tap the chart, then tap Edit Data.
2. Do any of the following: Add a data series: Tap cells, then enter the data for your new data series. Remove a data series: Tap the bar for the row or column you want to delete, then tap Delete. …
3. Tap Done to return to the chart.