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its is complicated math...sorry no answer
positive slope, the line goes up (increases) from left to right negative slope, the line goes down (decreases) from left to right zero slope, the line is horizontal (flat) undefined slope, the line is vertical (straight up)
The slope of a line is rise over run. That is to say, how many units the line rises for every unit it travels laterally.
We know that its slope is negative, but without an equation or some points the line passes through we can't determine the actual value of the slope.
Line graphs show increases or decreases in something over time.