If-a-b-b-c-3d-c-2c-d-8-1-7-6-then-a-b-c-d-A-53-7-B-18-7-C-43-7-D-38-7-E-53-7-

Question Number 89649 by jagoll last updated on 18/Apr/20

If (\begin{matrix} a - b b + c \\ 3 d + c 2 c - d \end{matrix}) = (\begin{matrix} 8 1 \\ 7 6 \end{matrix})

then a + b + c + d =

A . - \frac{53}{7} B . - \frac{18}{7} C . \frac{43}{7}

D . \frac{38}{7} E . \frac{53}{7}

Commented by jagoll last updated on 18/Apr/20

i^{'} m got \frac{53}{7} . it correct ?

Commented by john santu last updated on 18/Apr/20

6 d + 2 c = 24

- d + 2 c = 6

- - - - - - -

7 d = 18 \Rightarrow d = \frac{18}{7} \land c = \frac{30}{7}

\Rightarrow b + c = 1 \Rightarrow b = - \frac{23}{7}

\Rightarrow a - b = 8 \Rightarrow a = \frac{33}{7}

∴ a + b + c + d = \frac{58}{7}

Commented by jagoll last updated on 19/Apr/20

thank you sir . you are correct

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