If 15X +17Y=21. 17X +15Y =11 Then find the value of X -Y.

Answer:

Let us consider the equations

15X + 17Y = 21……………..(1)

17X + 15Y = 11……………..(2)

Subtracting equation (1) and equation (2)  we get

– 2X + 2Y = 10…………….(3)

Taking 2 as a common factor from equation (3)

– X + Y = 5………………….(4)

Multiplying equation (4) by (-), we get

X – Y = -5

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