Question

como resolver essa equaçaõ 3x-y=2 e 4x+5y=9

Answer 1

3x-y=2
3x=2+y
x=2+y/3

4x+5y=9
4.(2+y/3)+5y=9
8+4y/3+5y=9
4y/3+5y=9-8
4y/3+5y=1
4y/3+5y/1=1/1
/3=/3
4y+15y=3
19y=3
y=3/19

x=2+y/3
x=2+3/19:3
x=5/3