№1497
3)[tex] \left \{ {{3x+y=4} \atop {5x+y=10}} \right. [/tex]
4)[tex] \left \{ {{8x-3y=7} \atop {3x+y=9}} \right. [/tex]
3)[tex] \left \{ {{3x+y=4} \atop {5x+y=10}} \right. [/tex]
4)[tex] \left \{ {{8x-3y=7} \atop {3x+y=9}} \right. [/tex]
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у=4-3*х
5*х+4-3*х=10
5*х-3*х=10-4
2*х=6
х=3
у=4-3*3=4-9=-5
4. Выразим из 2 уравнения у , подставим в 1 уравнение.
у=9-3*х
8*х-3*(9-3*х)=7
8*х-27+9*х=7
8*х+9*х=7+27
17*х=34
х=2
у=9-3*2=9-6=3