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Rates & proportional relationships

The unit rate of change of yy with respect to xx is the amount yy changes for a change of one unit in xx.
The table below represents a proportional relationship with a constant unit rate of change of yy with respect to xx.
Which describes a greater unit rate of change of yy with respect to xx, the equation y=4.5xy=4.5x or the table?
xx224466
yy9918182727