2x-3y = 4
-3y = -2x+4
y = 2/3x-4/3
So the slope is 2/3 and the intercept is -4/3
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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.
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