1.

If x+y =18 and x = 5y, find x

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ANSWER:

x + y = 18......(1) \\ x = 5y .........(2) \\ putting \: the \: value \: of \: x \: in \: equation \: first \\ 5y + y = 18 \\ 6y = 18 \\ y =  \frac{18}{6 }  \\ y = 3



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