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y = –3x + 5
m = –3.
K(–2, –4) maka x1 = –2, y1 = –4.
y – y1 = m (x – x1)
y – (–4) = –3(x – (–2))
y + 4 = –3x – 6
y = –3x – 6 – 4
y = –3x –10
persamaan garis y = –3x – 10 atau 3x + y + 10 = 0