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dik:
a=6
b=-2
c=-90
x1=5
y1=9
x1x+y1y+a/2(x+x1)+b/2(y+y1)+C=0
5x+9y+6/2(x+5)+(-2)/2(y+9)+(-90)=0
5x+9y+3(x+5)-1(y+9)-90=0
5x+9y+3x+15-y-9-90=0
8x+8y-84=0
x1x+y1y+6/2 (x1+x)-2/2 (y1+y)-90=0
5x+9y+3 (5+x) -1(9 +y) - 90=0
5x+9y+15+3x -9 -y-90=0
8x+8y-84=0
2x+2y - 21=0