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y = -2x +3
y + 2x - 3 = 0
gradien = - 1/2
gradien garis singgung = 2 ( dibalik dikali min karena tegak lurus )
pgs =
y-b = m(x-a)
y-5 = 2 [x-(-2)]
y-5 = 2 (x+2)
y-5 = 2x + 4
y -2x -9 = 0
maaf kalau salah