Q. What is the slope of the line through (−1,8) and (3,−4)? Choose 1 answer: (A) −31(B) 31(C) 3(D) −3
Identify the slope formula: Identify the slope formula.The slope of a line through two points (x1,y1) and (x2,y2) is given by the formula:Slope = x2−x1y2−y1
Substitute the given points: Substitute the given points into the slope formula.We have the points (−1,8) and (3,−4), so x1=−1, y1=8, x2=3, and y2=−4.Slope =(3−(−1))(−4−8)
Calculate the change in y: Calculate the change in y y2−y1.Change in y = −4−8=−12
Calculate the change in x: Calculate the change in x (x2−x1).Change in x = 3−(−1)=3+1=4
Calculate the slope: Calculate the slope using the changes in y and x.Slope = 4−12 = −3
Match the calculated slope: Match the calculated slope to the given answer choices.The calculated slope is −3, which corresponds to answer choice (D).