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2y+8=5x-15
5x-2y-23=0
y -(-4) = 5/2(x -3)
y +4 = 5/2x -15/2 dikali 2 untuk menghilangkan penyebut, sehingga
2y +8 = 5x -15
2y = 5x -15 -8
2y = 5x -23
5x -2y -23 = 0