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Rates & proportional relationships

Problem

The unit rate of change of y with respect to x is the amount y changes for a change of one unit in x.
The table below represents a proportional relationship with a constant unit rate of change of y with respect to x.
Which describes a greater unit rate of change of y with respect to x, the equation y, equals, 0, point, 25, x or the table?
x1234
y0, point, 40, point, 81, point, 21, point, 6
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