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Question

Show that the solution set of the following system of linear equations has no solution:

2x+y8,x+2y10,xo,y0

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Solution

Converting the given inequation,we obtain,2x+y=8,x+2y=10,x=0,y=0

Region represented by 2x+y8

The line 2x+y=8 meets the coordinate axes at (0.8) and (4,0).We find that (0,0) does not satisfy inequation 2x+y8.So the portion not containing the origin is represented by the inequation 2x+y8.

Region represented by x+2y10

The line x+2y=10meets the coordinate axes at (0,5) and (10,0).We find that satisfies containing (0,0) does not satisfy inequation x+2y10.

Region represented by x0

Clearly,x0 represents the region lying on the right side of y-axis.

Region represented by y0

Clearly,y0 represents the region lying on the right side of x-axis.

From graph we can see that the solution set satisfying the given inequalities is an unbounded region.


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