Question

nu inteleg cum sa face.trebuie prin metoda substitutiei.Va rog poza cu rezolvarea​

Answer 1

Răspuns:

7,5=75/10=15/2

-4,1 = -41/10

2x=15/2 + 3y =>x=(15/2 + 3y)/2=(15+6y)/4

5(15+6y)/4 + y = -41/10 |•20

25(15+6y) + 20y = -82

375+170y= -92

170y= -92-375

170y= -467

y=(-467/170)

x=[15 + 6•(-467/170)]/4

x=[15 + 3•(-467/85)]/4

x=(15 - 1401/85)/4

x=(1275-1401)/340

x=(-126/340)=(-63/170)