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c : 3
jawab : y = mx + c
y = 1/2 x + 3
m= -2
- y-y1 = m (x-x1)
y-3 = -2 (x-4)
y-3 = -2x + 8
y = -2x + 8 + 3
y = -2x + 11
jadi, persamaannya yaitu y= -2x + 11