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y=2x +5
m=2 (gradiennya)
2. 2y+6x=12
2y = -6x+12
y= -6 x/2 +12/2
y =-3x +6
jadi gradiennya : m= -3
3. m =(y2-y1) /(x2-x1)
m= (6-5)/(4-2)
m =1/2