Question

(iii) If 5x+4y= 13 and 4x + 5y=14, find the value of (x - y).
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Answer 1

5x+4y= 13

5x = 13-4y

x= 13-4y/5

4x+5y=13

5y= 13-4x

y = 13-4x/5

so X-Y

= 13-4y/5 - 13+4x/5

= 13-4y-13+4x/5

= -4y+4x/5

= -4(y-x)/5

Answer 2

Answer:

On substracting the given equation.

$5x + 4y = 13 \\ - ( 4x + 5y = 14) \\ = x - y = - 1$

therefore answer, is -1

hope it will be helpful

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