y=-4x, k=tgα=-4
P(0,5) , x1=0, y1=5
y-y1=k(x-x1)
y-5=-4(x-0)
y-5=-4x
y=-4x+5
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y=-4x, k=tgα=-4
P(0,5) , x1=0, y1=5
y-y1=k(x-x1)
y-5=-4(x-0)
y-5=-4x
y=-4x+5
===========