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y = 8 x pangkat 2 - 33x
y= -x
(-)
0 = 8 x pangkat 2 - 32 x (dibagi 8)
0 = x pangkat 2 - 4x
x pangkat 2 = 4x
x = 4
substitusi nilai X = 4 ke Y
y = -x
y = -4
jadi titik potong ialah (4,-4)