The slope of the line is 6. To find this, first take two points, I took the points 15,-10 and 17,2. Then use these points in the slope formula, y2-y1 over x2-x1.
2-(-10), or 2+10 since you’re subtracting a negative and they cancel out is equal to 12. Now take your two x points, 15 and 17. 17-15 is equal to 2. Take 12 and divide it by the 2, which is then 6. Hope this helps.