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What is the slope of the line through 
(-1,8) and 
(3,-4) ?
Choose 1 answer:
(A) 
-(1)/(3)
(B) 
(1)/(3)
(c) 3
(D) -3

What is the slope of the line through (1,8)(-1,8) and (3,4)(3,-4)? Choose 11 answer: \newline(A) 13-\frac{1}{3} \newline(B) 13\frac{1}{3} \newline(C) 33 \newline(D) 3-3

Full solution

Q. What is the slope of the line through (1,8)(-1,8) and (3,4)(3,-4)? Choose 11 answer: \newline(A) 13-\frac{1}{3} \newline(B) 13\frac{1}{3} \newline(C) 33 \newline(D) 3-3
  1. Identify the slope formula: Identify the slope formula.\newlineThe slope of a line through two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is given by the formula:\newlineSlope = y2y1x2x1\frac{y_2 - y_1}{x_2 - x_1}
  2. Substitute the given points: Substitute the given points into the slope formula.\newlineWe have the points (1,8)(-1, 8) and (3,4)(3, -4), so x1=1x_1 = -1, y1=8y_1 = 8, x2=3x_2 = 3, and y2=4y_2 = -4.\newlineSlope =(48)(3(1))= \frac{(-4 - 8)}{(3 - (-1))}
  3. Calculate the change in y: Calculate the change in y y2y1y_2 - y_1.\newlineChange in y = 48=12-4 - 8 = -12
  4. Calculate the change in x: Calculate the change in x (x2x1)(x_2 - x_1).\newlineChange in x = 3(1)=3+1=43 - (-1) = 3 + 1 = 4
  5. Calculate the slope: Calculate the slope using the changes in y and x.\newlineSlope = 124\frac{-12}{4} = 3-3
  6. Match the calculated slope: Match the calculated slope to the given answer choices.\newlineThe calculated slope is 3-3, which corresponds to answer choice (D).

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