if 15x+17y=31 and 17x+15y=21 find the value of (x-y)
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Given:
15x+17y=31 and 17x+15y=21
To Find:
find the value of (x-y)
Solution:
We are given two equations 15x+17y=31 and 17x+15y=21 and we need to find the value of (x-y), we can solve the equation by elimination method,
-(1)
-(2)
Subtracting equation 2 from 1, we have
So the value of x-y=5 ( we multiplied both sides of the equation with -1 when y-x=5 because we needed to find the value of x-y)
Hence, the value (x-y) is -5.
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