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3y = -5x + 8
y = -5/3 x + 8/3
gradien = -5/3
gradien tegak lurusnya = 3/5
y-4 = 3/5(x + 2)
y - 4 = 3/5x + 6/5
y = 3/5x + 6/5 + 4
y = 3/5x + 26/5
5y = 3x + 26
3x - 5y + 26 = 0
2. 8*8*8 = 1/8 + 1/8 + 1/8 = 3/8