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m = 4/3
y-y1 = m(x-x1)
y-3 = 4/3(x-2)
y = 4/3x - 8/3 + 3 kalikan 3
3y = 4x -8 + 9
3y = 4x + 1
-4x + 3y = 1 kalikan -1
4x - 3y = -1