Zadanie z matmy.
Rozwiąż układ równań:
a) 2(x-3) - 7(y+1)=9
3(x+y) - 2(x-y)= - 6
Zatem:
2x-6-7y-7=9
3x+3y-2x+2y=-6
2x-7y=22
x+5y=-6 /*(-2)
-2x-10y=12
Dodaję stronami:
-17y=34
x=-6-5y
y=-2
x=-6+10
x=4
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Zatem:
2x-6-7y-7=9
3x+3y-2x+2y=-6
2x-7y=22
x+5y=-6 /*(-2)
2x-7y=22
-2x-10y=12
Dodaję stronami:
-17y=34
x=-6-5y
y=-2
x=-6+10
x=4
y=-2