Question

3^x+y = 1 e 2^x+2y= 2, qual o valor de x-y?

Answer 1

3^x + y=1
fazendo 3^x= y
y+ y= 1
2y= 1
y= 1/2

3^x +1/2= 1
3^x= 1-1/2
 3^x= 1/2

2^x +2y=2
2^x+ 2(1/2) =2
2^x= 1
2^x= 2^0
x= 0