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-11=-5x+9
-20=-5x
x=4
2. m=3 didapat dari persamaa y=3x+2
y-y1=m(x-x1)
y+1=3(x-4)
y= 3x-12-1
y=3x-13
y-y1 = m(x-x1)
y+1 = -3(x-4)
y+1 = -3x + 12
3x+y+1-12 = 0
3x+y-11 = 0 / y = -3x+11