[tex]\left \{ {{7x+2y=156} \atop {3x-2y=9}} \right.[/tex]
10x=165
x=165 : 10
x=16,5
[tex]\left \{ {{x=16,5} \atop {7*16,5+2y=156}} \right.[/tex]
7*16,5+2у=156
115,5+2у=156
2у=156-115,5
2у=40,5
у=40,5:2
у=20,25
[tex]\left \{ {{x=16,5} \atop {y=20,25}} \right.[/tex]
Ответ: (16,5 ; 20,25)
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[tex]\left \{ {{7x+2y=156} \atop {3x-2y=9}} \right.[/tex]
10x=165
x=165 : 10
x=16,5
[tex]\left \{ {{x=16,5} \atop {7*16,5+2y=156}} \right.[/tex]
7*16,5+2у=156
115,5+2у=156
2у=156-115,5
2у=40,5
у=40,5:2
у=20,25
[tex]\left \{ {{x=16,5} \atop {y=20,25}} \right.[/tex]
Ответ: (16,5 ; 20,25)