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(gradien) M=3 .... (0,-4)
y-y1=m(x-x1)
y+4=3(x-0)
y+4=3x
y= 3x-4
4c.
M=4..... (-2,1)
y-y1 = m(x-x1)
y-1 = 4(x+2)
y-1 = 4x+8
y= 4x+8+1
y= 9