Mathematics
Grade10
Easy

Question

Write the equation in point-slope form of the line that passes through the given point and has the given slope:
(-2, -1); m= -3

  1. y + 1 = -3(x - 2)
  2. y + 1 = -3(x + 2)
  3. y - 1 = 3(x - 1)
  4. y + 2 = -3(x + 1)

Hint:

Point-slope form of equation of a line is y - y1 = m (x - x1) ,
where m is slope and ( x1 , y1 ) is the point .

The correct answer is: y + 1 = -3(x + 2)


    Given the Point (-2, -1);
    and slope m= -3
    Step 1 : Point-slope form of equation of a line is y - y1 = m (x - x1)
    Step 2 : Substitute (-2, -1) in (x1, y1) and -3 in m,
    we get y + 1 = -3(x + 2)
    y + 1 = -3(x + 2) is the desired equation in point slope form .

    Point-slope form of equation of a line is y - y1 = m (x - x1),

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