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If x+ y = 21 and …

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If x+ y = 21 and x × y= 80 then find x and y.

Posted by Shri Niwas Jat 8 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Naveen Sharma 8 years, 9 months ago

Ans. x + y = 21 ......(1)

xy = 80 .....(2)

From (1)

x = 21-y

(21-y)×y = 80

=> 21y - y² = 80

=> y²-21y +80 = 0

=> y² -16y -5y +80=0

=> y(y-16)-5(y-16) = 0

=> (y-16)(y-5) = 0

=> y = 16 or y = 5

If y =16 then x = 5

If y =5 then x =16

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