Question

2x + 3y= 8
5x - 3y = -1

Answer 1

2x+3y=8
5x-3y=-1
------------
7x=7
x=7/7
x=1

Answer 2

Isolar o "x" da II: 
> 5x = 2y+1 
> x = (2y+1)/5  
> 2[(2y+1)/5]+3y=8 
> (4y+2)/5+3y=8 
> MMC: (4y+2+15y=40)/5 
> 4y+2+15y=40 
> 19y = 40-2 
> 19y = 38 
> y = 38/19 
> y = 2 
> x = (2.2+1)/5 
> x = 5/5 
> x = 1 
 x = 1 e y = 2