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You should use parentheses when substituting?

 Mar 9, 2021
 #1
avatar+31195 
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I would say true.....

 

here is an example

 

2x     - 3y    =12           and y = x-1   sub in y

2x  - 3 (x-1) = 12            without parens, the final derived  answer would be incorrect

 Mar 9, 2021
 #2
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You should use parentheses when substituting?    

 

It is better to not need parentheses and use them, than to need parentheses and not use them.  

 Mar 9, 2021

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