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y--4 = -3 ( x-3)
y+4 = -3x +9
y = -3x +9-4
y+3x = 5
atau
y+3x-5 = 0
gradien = - 3/ -1 = 3
persamaam garis... (y+4) = 3( x-3)
y+4 = 3x -9
y = 3x -13
atau 3× = y + 13
x = 1/3 y + 13/3