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*Ubah 3y - 5x + 12 = 0 menjadi berpola y = mx + c*3y - 5x + 12 = 0
3y = 5x - 12
y = 5/3x - 4
maka, gradien (m) = 5/3
*garis yang tegak lurus >> m1 × m2 = -1
5/3 × m2 = -1
m2 = -1 ÷ 5/3
m2 = -1 × 3/5
m2 = -3/5
*tentukan persamaan garisnya*
y - y1 = m(x - x1)
y - (-6) = -3/5(x - 5)
y + 6 = -3/5x + 3
y = -3/5x + 3 - 6
y = -3/5x - 3 (bisa juga ditulis 5y = -3x - 15)