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Graph a system of equations fast

Sometimes substitution or elimination is not the best option for solving a system of equation fast. In this version of the ...

[Junior High School Entrance Exam Math] Place Compensation Problems on the 'Height' of an Area Diagram | A Method to Avoid Tripping Over Signs

"I can do Tsurukame-zan (crane and turtle problems), but I freeze up when it comes to compensation problems." is rare to hear ...