Question

Rozwiąż układy równań metodą podstawiania 3m+n=9
2m-5n=-11

4a-2=b
3a+7b=1.5

5x=4-2y
4x+y=3
Daje naj

Answer 1

3m + n = 9
2m - 5n = -11

n = 9 - 3m
2m - 5n = -11

n = 9 - 3m
2m - 5(9 - 3m) = -11

n = 9 - 3m
2m - 45 - 15m = -11

n = 9 - 3m
- 13m = -11 + 45

n = 9 - 3m
-13m = 34 /: (-13)
m = -
m = -2

n = 9 - 3·(-2)
m = -2

n = 9 + 
m = -2

n = 9[text] /frac{102}{13} [/text]
m = -2[text] /frac{8}{13} [/text]