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For a negative slope, the rise is negative and the run is positive.
Positive correlation has a positive slope and negative correlation has a negative slope.
The answer depends on the signs of the original intercepts.x negative, y negative: negative slope becomes less negative and could go positive.x negative, y positive: positive slope becomes greater.x positive, y negative: positive slope becomes less positive and could go negative.x positive, y positive: negative slope becomes more negative.For 1 and 3, the slope changes sign when the y intercept crosses the origin.
negative
If the pressure is increasing then the slope is positive. If the pressure is decreasing then the slope is negative.