That is perfectly normal. The slope of the graph for converting inches to centimetres is not a whole number!
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Any number from 0 up. Example: Whole Number: 5 Not a Whole Number: 5.5
No it isnt. The "-2" part is a whole number, but once you start tacking on more fragments and bits after the decimal point, you don't have a whole number any more.
9x is 9 on the x axis.
The slope of a line on a graph can be zero, or any positive or negative real whole number or fraction or decimal.
Then the gradient or slope is a fraction. That is no big deal.