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y - (-2) = -4 (x - 1)
y + 2 = -4x + 4
4x + y = 2
gradien (m) = -4
y1 = -2
x1 = 1
persamaan umum : y-y1 = m ( x-x1)
=> y - (-2) = -4 ( x - 1 )
=> y +2 = -4x +4
=> y = -4 x +4 -2
=> y = -4x +2
=> f(x) = -4x +2