Question

Rezolva urmatorul sistem de ecuatii cu metoda reducerii
2(x+1)-3(y+2)=7
5x+2(y-1)=19

Answer 1

Răspuns:

Explicație pas cu pas:

2x + 2 - 3y - 6 = 7

2x - 3y - 4 = 7

2x - 3y = 4 + 7

2x - 3y = 11

_________

5x + 2y - 2 = 19

5x + 2y = 2 + 19

5x + 2y = 21

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2x - 3y = 11

5x + 2y = 21

4x - 6y = 22

15x + 6y = 63

adunam ecuatiile

19x = 85

x = 85/19

3y = 2x - 11 = 170/19 - 11 = 170/19 - 209/19 = -39/19

y = -39/19 : 3 = -13/19