Respuesta :

Hagrid

This is a trial and error answer.

Suppose that QT = -3, then

x + 2 = y

2x = y + 3

Apply substitution,

2x = (x+2) + 3

2x = x + 5

x = 5

y = 7

chek your answer,

x + 2 = y

5 + 2 = 7