Respuesta :

I hope this helps you
Ver imagen Аноним

2a plus 3b =12

5a minus 1b =13  multiply this by -3 to match 3b in equation 1

2a plus 3b =12

-15 plus 3b =-36

plus 15           plus 15

3b= -21

divide by 3  on both sides

b= -7