David W. answered • 11d

Experienced Prof

N + F = 52 [number of questions]

9N + 5F = 408 [total number of points]

9N + 5F = 408)

- (5N + 5F = 260)

------------------------ [Elimination; subtract equations]

4N = 148

** N = 37 questions**

37 + F = 52 [plug N into either equation)

** F = 15 questions **

Check (very important):

Is 9*37 + 5*15 = 408 ?

333 + 75 =408 ?

408 = 406 ?yes

Anonymous

Can you help me on showing me on how to work the equation with that method?12d