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    Mathematics
    Grade10
    Easy

    Question

    What is the value of y in the equation x + y = 100?

    1. y = 100 – y
    2. y = 100 – x
    3. x = 100 – y 
    4. None of the above

    The correct answer is: y = 100 – x

      y space equals space 100 space minus space x space comma space i s space t h e space c o r r e c t space c h o i c e space g i v e n space e q u a t i o n space x plus space y space equals space 100 w e n h a v e space t o space f i n d space t h e space v a l u e space o f space y space comma s o space w e space h a v e space t o space r e m o v e space x space t o space t h e space l e f t space s i d e space o f space t h e space e q u a t i o n x space plus space y space minus space x space equals space 100 space minus x space space left parenthesis space s u b s t r a c t space x space f r o m space b o t h space s i d e right parenthesis y space equals space 100 space minus space x space comma space i s space t h e space a n s w e r

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