va rog urgent Dau cororana rezolvare completa

Răspuns:
4a-2b=5 /*11 => 44a-22b=55
5b-3a=-23 /*10 => 50b-30a=-230
adunam cele 2 ecuatii
44a-22b+50b-30a=55-230
14a+28b=-175 /:14
a+2b=-12.5 /*3
3a+6b=-37.5