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m2=-5/2
y-y1=m(x-x1)
y-1=-5/2(x+2)
2y-2=-5x-10
2y-2+10+5x=0
5x+2y+8=0
atau
2y=-5x-8
y=-5/2x-4
m₁=y2-y1/x2-x1=-2-(-4)/0-(-5)=2/5
gradien gris yg slng tegak lurus
m₁ x m₂ =-1
2/5 m₂= -1
m₂=-5/2
persmaan garisnya
y-y1=m(x-x1)
y-1= -5/2(x-(-2))
y-1=-5/2x-5
y=-5/2x -4
atau 5x+y+4=0