Slope = change in y ÷ change in x = (-9 − -6) ÷ (1 − -2) = -3 ÷ 3 = -1. Here, slope tells how much y changes for each 1-unit change in x. A negative slope means the line goes downward from left to right, while a positive slope means it goes upward. Always subtract the coordinates in the same order for y and x so the sign of the slope stays correct. The correct answer is -1, which matches the calculation or reasoning shown.