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a=b+c-2
a=c-d+9
a=b-d+11
Based on the system of equations above, what is the value of a?
a) 2
b) 9
c) 10
d) 11
e) 20

  • math -

    can't tell. There are 4 unknowns, but only three equations. Any system where

    c = b+2
    b+d = 11

    will work. For example, the table below shows various values of a

    b c d a
    1 3 10 2
    2 4 9 4
    . . .

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