20. Find k for which the system x + 2y = 3 and 5x + ky + 7 = 0 is inconsistent.
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for incosistent the condition is
a1/a2=b1/b2=c1/c2
on comparing eq. with a1x+b1x+c1=0
we get a1=1,b1=2 and c1=-3
on comparing eq. 2 with a2x+b2x+c2=0
we get a2=5,b2=k and c2=7
a1/a2=b1/b2
1/5=2/k
k=10
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