Решите систему уравнений, пожалуста.) х+у/4 - х-у/ 3 = 10 х+у/8 + х-у /6 = 5

( x + y ) / 4 - ( x - y ) / 3 = 10
( x + y ) / 8 + ( x - y ) / 6 = 5
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x + y = a ; x - y = b
( a / 4 ) - ( b / 3 ) = 10
( a / 8 ) + ( b / 6 ) = 5
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3a - 4b = 120
3a + 4b = 120
6a = 240
a = 40
4b = 120 - 120
b = 0
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x + y = 40
x - y = 0
2x = 40
x = 20
y = 40 - x
y = 20
ОТВЕТ ( 20 ; 20 )
Проверка
( 20 + 20 ) / 4 - ( 20 - 20 ) / 3 = 10
( 20 + 20 ) / 8 + ( 20 - 20 ) / 6 = 5
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( 40 / 4 ) - 0 = 10
( 40 / 8 ) + 0 = 5
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10 = 10
5 = 5