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Line k goes through the points (–5, 3) and (–2, 1). Line m goes through the points (0, –3) and (2, 1). What is the point of intersection of lines k and m? A. (–1, 1) B. (1, –1) C. (1, 0) D. (2, 1)

Question

Line k goes through the points (–5, 3) and (–2, 1). Line m goes through the points (0, –3) and (2, 1). What is the point of intersection of lines k and m? A. (–1, 1) B. (1, –1) C. (1, 0) D. (2, 1)

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Solution

To find the point of intersection of two lines, we first need to find the equations of the lines.

  1. Find the slope of line k: The slope (m) is given by the formula m = (y2 - y1) / (x2 - x1) For line k, using the points (–5, 3) and (–2, 1), the slope is m = (1 - 3) / (-2 - (-5)) = -2 / 3 = -2/3

  2. Find the equation of line k: The equation of a line is given by y = mx + b, where m is the slope and b is the y-intercept. To find b, substitute one of the points and the slope into the equation. Let's use the point (-5, 3). 3 = -2/3 * -5 + b 3 = 10/3 + b b = 3 - 10/3 = 9/3 - 10/3 = -1/3 So, the equation of line k is y = -2/3x - 1/3

  3. Repeat steps 1 and 2 for line m: The slope of line m, using the points (0, -3) and (2, 1), is m = (1 - -3) / (2 - 0) = 4 / 2 = 2 To find b, substitute one of the points and the slope into the equation. Let's use the point (0, -3). -3 = 2 * 0 + b -3 = b So, the equation of line m is y = 2x - 3

  4. Find the point of intersection: Set the two equations equal to each other and solve for x: -2/3x - 1/3 = 2x - 3 Multiply everything by 3 to get rid of the fractions: -2x - 1 = 6x - 9 Add 2x to both sides: -1 = 8x - 9 Add 9 to both sides: 8 = 8x Divide by 8: x = 1

  5. Substitute x = 1 into either of the original equations to find y. Let's use y = 2x - 3: y = 2*1 - 3 = 2 - 3 = -1

So, the point of intersection of lines k and m is (1, -1), which corresponds to option B.

This problem has been solved

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