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Dengan,
m = gradien
15x +3y = -7
3y = -15x -7
y = -15/3x -7/3
y = -5x -73
Maka, m (gradien) = -5.
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Apabila soalnya seperti ini :
15y +3x = -7
15y = -3x -7
y = -3/15x -7/15
y = -1/5x -7/15
Maka, m (gradien) = -1/5.