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2y = -4x + 6
y = -2x + 3
m = -2
y-y1 = m(x-x1)
y+5 = -2(x-2)
y+5 = -2x+4
y+2x+1 = 0
garis gradiennya ==-2
y-y1=m(x-x1)
y+5=-2(x-2)
y+2x+1