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y - y1 = m(x-x1)
y -(-1) = -2/3(x - 2)
y + 1 = -2/3x + 4/3
------dikali 3 ------
3y + 3 = -2x + 4
3y + 2x = 1
Jadi persamaan garisnya adalah 3y + 2x = 1
semoga membantu