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5y = - 3x + 15
y = (-3/5)x + 3
m = - 3/5
Persamaan garisnya:
y - b = m(x - a)
y - 3 = (-3/5)(x - 2)
5y - 15 = - 3x + 6
3x + 5y - 21 = 0
Karena sejajar, maka gradiennya sama :
Jadi, persamaan garis 3x + 5y = 15 dan melalui titik (2,3) sejajar dengan persamaan garis