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y - y1 =m (x - x1 )
y - 4 = -2 (x - 1 )
y - 4 = -2x -2
y = -2x -2 + 4
y =-2x + 2
b. (-2,-5) ----> x1 = -2 y1= -5 m= -2
y - y1 = m (x-x1)
y-(-5) = -2 (x-(-2))
y+5 = -2 (x+2)
y+5 = -2x -4
y= -2x-4-5
y= -2x+9
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