Respuesta :
Set up an equation:
45 = 4x +5 Subtract 5 from both sides.
40 = 4x Divide by 10 on both sides
10 = x.
Sal is 10 years old.
45 = 4x +5 Subtract 5 from both sides.
40 = 4x Divide by 10 on both sides
10 = x.
Sal is 10 years old.
Sal is 10 years old. If you want to check you can do 10*4+5 and get 45