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1) y - 6 = 1/2 × - 3
y = 1/2 x - 3 + 6
y = 1/2 x + 3
m = 1/2
2) y = -4x -3
m = -4
3) y = 1/2x -2
m = 1/2
4) 2y = 1/2 x + 4
y = (1/2 : 2) x + 4/2
y = 1/4 x + 2
m = 1/4
Dari uraian di atas, persamaan yg gradiennya sama adalah garis 1 dan 3, sehingga garis 1 dan 3 sejajar.