( x - y ) = a ; ( x + y ) = b
( 6 / a ) - ( 8 / b ) = - 2
( 9 / a ) + ( 10 / b ) = = 8
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6b - 8a = - 2ab
9b + 10a = 8ab
a и b не равны нулю
4( 6b - 8a ) = - 8ab
24b - 32a + 9b + 10a = 0
33b - 22a = 0
11( 3b - 2a ) = 0
3b = 2a
a = 1,5b
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( 6 / a ) - ( 8 / b ) = - 2
( 6 / 1,5b ) - ( 8 / b ) = - 2
( 6 - 8•1,5 ) / 1,5b = - 2
- 6 = - 3b
b = 2
a = 1,5 • 2 = 3
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x - y = 3
x + y = 2
2x = 5
x = 2,5
y = 2 - 2,5 = - 0,5
Ответ ( 2,5 ; - 0,5 )