A, b, and c are collinear, and b is between a and c. the ratio of ab, to ac, is 1: 3. if a is at (−2,−3) b is at (-6,-1) what are the coordinates of point c?

I believe that it would be (-18, 13). All I did was multiply the distance between A and B by four then found a point that was 22.8 units away but still along the same line. 

The correct answer will be d. -4

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!