9x is 9 on the x axis.
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That is perfectly normal. The slope of the graph for converting inches to centimetres is not a whole number!
The slope of a line on a graph can be zero, or any positive or negative real whole number or fraction or decimal.
The slope of the graph of [ y = x + any number ] is 1 .
The slope for a straight line graph is the ratio of the amount by which the graph goes up (the rise) for every unit that it goes to the right (the run). If the graph goes down, the slope is negative. For a curved graph, the gradient at any point is the slope of the tangent to the graph at that point.
On the standard Cartesian graph, horizontal lines have zero slope. They all have the equation Y = a number