Adata set consists of the following pairs of data: (3,5), (5,8), (6,13) will the correlation coefficient for these data points be positive or negative?

Positive correlation means that if x goes up then y goes up, negative correlation means that if x goes up then y goes down.  Since both x and y are increasing each time, it is positive. 

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!