Resposta :
( 2x+y 3x-y ) = ( 7 16 )
2x + y = 7
3x - y = 16
5x = 23
x= 23/5
2x+y = 7
y = 7 - 2x
y = 7 - 2.23/5
y = 7 - 46/5
y = (35 - 46)/5
y = - 11/5
2x + y = 7
3x - y = 16
5x = 23
x= 23/5
2x+y = 7
y = 7 - 2x
y = 7 - 2.23/5
y = 7 - 46/5
y = (35 - 46)/5
y = - 11/5