Question

resolva os sistemas de equaçoes
3a-2b=7
5a+4b=-25

Answer 1

3a-2b=7 .(2)
5a+4b=-25

6a-4b=14
5a+4b= -25

11a=-11
a=-11/11
a= -1

5.(-1)+4b=-25
-5+4b=-25
4b=-25+5
4b=-20
b= -20/4
b= -5