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2y ,= -4x + 8
y = (-4x + 8)/2
y = -2x + 4 ==> gradien m = -2 dan melalui (3, 4)
y - y1 = m (x - x1)
y - 4 = -2 (x - 3)
y - 4 = -2x + 6
y = -2x + 6 + 4
y = -2x + 10
2y = -4x+8
y = -4x+8/2
y= -4x+4
persamaan garis/ gradien = -4