zad 5 str 99 rozwiąż układy równań metodą poodstawiania:
3m + n = 9
2m - 5n = -11
Proszę o dobre rozwiązania !!!
3m +n = 9
2m -5n = -11
n = 9 -3m
2m-5(9-3m) =-11
2m - 45 + 15m =-11
17m = 34 /:17
m = 2
n = 9-3m = 9-6=3
odp:
m=2
n=3
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3m +n = 9
2m -5n = -11
n = 9 -3m
2m-5(9-3m) =-11
2m - 45 + 15m =-11
17m = 34 /:17
m = 2
n = 9-3m = 9-6=3
odp:
m=2
n=3