tolong jawab 4a&4b sekarang

A.
Y-y1 = m(x-x1)
y-4 = -1/3(x-0)
y-4= -1/3x
Y = -1/3x -4

B.
Y-y1=m(x-x1)
y-(-2) = -4 (x-1)
y+2= -4x +4
y= -4x +4-2
Y = -4x + 2