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persm grs :
y-y1 = m(x-x1)
y-1 = 4/3 (x+2)
3y-3 = 4x+8
4x-3y+11 = 0
m1=(-5-3)/(-2-4)=-8/-6=4/3
pers garis: y-1=(4/3)(x-(-2))⇒y-1=(4/3)x+(8/3)⇒3y-3=4x+8⇒3y=4x+11