When there is a positive trend (or positive correlation), do the y-values of the points on the scatter plot tend to increase or decrease as the x-values increase?

As the y-axes decreases the x-axes increases 

As the x-values increase, y-values should decrease as the rule for positive correlations is that while one variable increases the other one decreases. In this problem's case, the x values are increasing therefore, the y values must decrease or it would not be a positive correlation.