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Question

The value of t for which the following system is consistent x+y=1, tx+y=t, (1+t)x+2y=3, is

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Solution

Given system of equation is consistent

∣ ∣111t1t1+t23∣ ∣=0

(t2) (1t)=0

t=2 or t=1

for t=1 system becomes

x+y=1, x+y=32 t1

So t=2 is the only solution.

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