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dengan y = 4, melalui (-2, 1) tegak lurus
rumusnya y - y1 = -1/m(x - x1) tegak lurus, dengan m = 4
y - 1 = -1/4(x - (-2))
y - 1 = -1/4(x + 2)
y - 1 = -1/4x - 1/2
y = -1/4x - 1/2 + 1
y = -1/4x + 1/2