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anonymous
 one year ago
Class has 50 question test, each correct answer is 2 pt, each wrong is .5, if no answer then no points. If student needs to earn 70 pt on the test then what is the equation in terms of incorrect answers
anonymous
 one year ago
Class has 50 question test, each correct answer is 2 pt, each wrong is .5, if no answer then no points. If student needs to earn 70 pt on the test then what is the equation in terms of incorrect answers

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triciaal
 one year ago
Best ResponseYou've already chosen the best response.0number correct = x number incorrect = 50x when all correct x = 50 ; points = 100 when all incorrect 50*(0.5) = 25 points to get 70 points 2x 0.5(50x)= 70

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so you dont solve for x but state its 50?

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1444105732138:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0the number of test question = 50

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0if you put in 50 for x then its 2x.5(0)? which is 100 if you replace x with 50

DN_20
 one year ago
Best ResponseYou've already chosen the best response.1So if 50 questions are all correct, then 50 (2) = 100 if 50 questions are all wrong, then 50 (.5) = 25 So x = # of right questions, y = # of wrong questions 2x .5y = 70 MY number I will say you will need x=38 and y =12 plug in 2 (38)  .5 (12) = 70 76  6 = 70 So the student needs at least 38 right and 12 wrong to get 70 points

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0DN_20 how did you know to use 38 and 12?

DN_20
 one year ago
Best ResponseYou've already chosen the best response.1So let see: (1)2x .5y = 70 (2)x + y = 50 Multiply the (1) by 2 4x  y = 140 x +y = 50 Eliminate y, add the rest 5x = 190 x = 38 Plug in x: 38 +y = 50 y= 12 There we go!!!!!!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0looks great. but what is the equation in terms of incorrect answers. Shouldnt it be equal to 30 not 70 to focus on incorrect possibles?

DN_20
 one year ago
Best ResponseYou've already chosen the best response.1Ok, so this is just the same: (1)2x .5y = 30 (2)x + y =50 So the same, you multiply (1) by 2 So 4x  y = 60 x+y = 50 Eliminate y, add the others: 5x = 110 x = 22 So y = 50 22 =28 They will need 16 correct and 34 wrong 2 (22) .5 (28)= 4414= 30 There.
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