SOLUTION: emma is doing a multiple choice test of 50 questions. she gets 2 marks for every question that is correct, but loses 1 mark for every question that is wrong. Emma answers every que

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Question 558421: emma is doing a multiple choice test of 50 questions. she gets 2 marks for every question that is correct, but loses 1 mark for every question that is wrong. Emma answers every question and scores 67 marks. How many questions did she get right?
Answer by solver91311(24713) About Me  (Show Source):
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Let represent the number of questions she got right and represent the number of questions she got wrong.

The total number of questions is 50 so:



The value of right answers is 2, the value of wrong answers is 1, and the total value of the sum of the right answers and the wrong answers is 67, so:



Solve the 2X2 system for

John

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