Question

2X-Y,PARA X= 7 E Y= -1/2

Answer 1

2x= 7x2 =14
y=-1/2= -0,5

14-(-0,5)
14+0,5
14,5

Answer 2

$2x-y \\ \\ x= 7 \\ \\ y= \frac{-1}{2} \\ \\ 2.(7)- \frac{-1}{2} \\ \\ 14- \frac{-1}{2} = \frac{28-1}{2} = \frac{27}{2}$