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\( a^{b}\)
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\(a_{b}\)
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x-2y+4=0
-2y=-x-4
y=x/2+2
But, m1m2=-1
m2=-1/m1
When m1=1/2
m2=-1/(1/2)
m2=-2
The equation of QR;
y=mx+c
the intersection is(1,-1)
y=mx+c
-1=1X(-2)+c
-1=-2+c
c=1
y=-2x+1
2x+y-1=0