use trail and error method to solve this:

a)y+5=12                     b) 4a=108

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A-7
B-27
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a) y+5=12
    y=12-5
    y=7
 ans=7

b)4a=108
   a=108/4=27
or
a)  subtracting 5 from each side we get
y+5-5=12-5
y=7 ans


b) 4a=108
divide both sides by 4 we get
4a/4= 108/4
a=108/4=27 Ans

        
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so hard
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a=7
b=27
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7+5 =12
27
 
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1) 7                     2) 27
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7         27
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