Question

Ma ajutai va rogggggggggggg (4a-5b)-(2b-7a)=4a-7a=5b-2b

Answer 1

       
$(4a-5b)-(2b-7a)=4a-7a=5b-2b \\ \text{Acesta este un sistem de 2 ecuatii cu 2 necunoscute:} \\ (4a-5b)-(2b-7a)=4a-7a \\ (4a-5b)-(2b-7a)=5b-2b \\ --- \\ 4a-7a -5b-2b=-3a \\ 4a-7a -5b-2b=3b \\ --- \\ -3a-7b=-3a \\ -3a-7b=3b \\ --- \\ -7b = -3a+3a \;\;\; =\ \textgreater \ \;\;-7b = 0 \;\;\;=\ \textgreater \ \;\;b = \boxed{0} \\ 3a-7b-3b =0 \\ \;3a-10b=0\;\;dar \;\;b=0\;\;\;=\ \textgreater \ \;\;3a=0\;\;=\ \textgreater \ \;\;a = \boxed{0}$