Respuesta :

Answer:

x-12=66 or 78 -12 =68

Step-by-step explanation:

3+2= 5    |||   5 is the answer, sum

difference 12 || difference= subtract

is = equals

                                                     

What I think ~

Answer:

Larger number = 39

Smaller number = 27

Step-by-step explanation:

x +  y = 66

x - y =   12                Add

2x = 78                    Divide by 2

2x/2 = 78/2

x = 39

x + y = 66               Substitute for x  

39 + y = 66            Subtract 39 from both sides.

39-39+y=66-39     Combine

y = 27

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