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2y = -7/4 x + 41/4
y = -7/8x + 41/8
gradien = -7/8
gradien tegak lurusnya = 8/7
y + 3 = 8/7(x + 2)
y + 3 = 8/7 x + 16/7
y = 8/7 x - 5/7
7y = 8x -5