Update Unit 6: System of Equations.md

Grade 9/Math/MPM1DZ/Unit 6: System of Equations.md

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 # Unit 6: System of Equations 
 
 ## Linear System
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 - Read the questions carefully and model the system of equations correctly   
 - Be sure to name your equations   
 - Label your lines   
-
-# General Tips
-- Be sure to watch out for units, like ```cm``` or ```km```   
-- Watch out for ```+/-```    
-- Be sure to reverse the operation when moving things to the other side of the equation   
-- Make sure to have a proper scale for graphs   
-- Read question carefully and use the appropriate tools to solve    
-- **WATCH OUT FOR CARELESS MISTAKES!!!!!!!!!!!**
-
-## Word Problems
-- Read carefully    
-- model equations correctly   
-- ```Reread``` the question over and over again until you fully understand it and made sure there is no tricks. :p      
-- ```Lets``` Statement     
-- ```Conclusion```
-
-## Graph Problems
-- Look up on tips in units (5) and (6)   
-- be sure to use a ruler when graphing
-
-## System of Equations
-- When in doubt or to check your work, just plug the numbers back in and check if the statement is true