If y=4/7, then the line is a horizontal line. This means that there is infinite change in the x value without any change in the y value, so slope (change in y/ change in x) will be 0 divided by any number. Thus the slope is 0.
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it equals 1
Since the equation y = -4 represents a horizontal line, then the slope of the line is 0.
The line x = -4 is vertical, so a line that is perpendicular to it is horizontal, so its slope is 0.
That's a vertical line; the slope is not defined.
7