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Mariana [72]
3 years ago
6

What is the slope of the line NP

Mathematics
1 answer:
Luba_88 [7]3 years ago
8 0

Answer:

The slope of NP is \frac{-5}{7} ⇒ B

Step-by-step explanation:

  • In any square, every two opposite sides are parallel and every two consecutive sides are perpendicular
  • Parallel lines have the same slope
  • The product of the slopes of the perpendicular lines is -1, which means if the slope of one m, then the slope of the other is \frac{-1}{m} (reciprocal m and change its sign)
  • The rule of the slope of the line which passes through the points (x1, y1) and (x2, y2) is m = \frac{y2-y1}{x2-x1}

In square MNPR

∵ MN and NP are adjacent sides

∴ MN ⊥ NP

∵ M = (3, 8) and N = (-2, 1)

∴ x1 = 3 and y1 = 8

∴ x2 = -2 and y2 = 1

→ Use the rule of the slope above to find the slope of MN

∴ m(MN) = \frac{1-8}{-2-3}

∴ m(MN) = \frac{-7}{-5}

∴ m(MN) = \frac{7}{5}

∵ MN ⊥ NP

∴ The product of their slopes = -1

→ Reciprocal the slope of MN and change its sign

∴ m(NP) = \frac{-5}{7}

∴ The slope of NP is \frac{-5}{7}

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