When the x-axis and y-axis have different units of measure the slope can be interpreted as a?

Rate (or rate of change)

Further explanation

This is part of a linear equation in two variables.

Recall the equation is called a linear equation in two variables. The graph of this equation in two variables x and y is a straight line. is called the slope-intercept form of the equation of a line, where m is the slope and the y-intercept is (0, c).

In any subject, the slope (or the gradient) of a line can be interpreted as either ratio or rate.

When the x-axis and y-axis have the same units of measure, the slope can be interpreted as a ratio, because the slope has no units.  For example, the ratio of the amount of money owned by two people, or the scale on the map.When the x-axis and y-axis have different units of measure, the slope can be interpreted as a rate or rate of change. For example, the rate of change in distance to travel time or speed.Learn moreDetermine the equation represents a line that passes through a point and has a slope Determine in the slope-intercept form, that is parallel to the given line and passes through a point    Determine an equation represents Nolan’s line

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I’d say letter a..