ICSE Class 10 Answered

<div>In questions liken"If x/y=7/0, find (2x-3y)/(5x-4y)." can't I just subtitute the values of x & y in the ques. or is it necessary to use the formula?If yes, then please explain me how to do it briefly.</div>

Asked by savi1405 | 10 Jun, 2016, 10:29: PM

Expert Answer

begin mathsize 12px style I f space x over y equals 7 over 10 comma space i t space d o e s space N O T space m e a n space x equals 7 comma space a n d space y equals 10. I t space s i m p l y space m e a n s space t h e space r a t i o space o f space x space t o space y space i s space a l w a y s space 7 colon 10. S o space w e space c a n t space a l w a y s space d i r e c t l y space s u b s t i t u t e. space T h e space b e s t space w a y space i s space t o space t a k e space apostrophe x apostrophe space a s space 7 a space a n d space y space a s space 10 space a. T h e n space d o space t h e space s i m p l i f i c a t i o n space o f space t h e space e x p r e s s i o n. space P l e a s e space n o t e space t h a t comma space i n space t h i s space e x p r e s s i o n space fraction numerator 2 x minus 3 y over denominator 5 x minus 4 y end fraction comma i t space w o n apostrophe t space m a k e space a n y space d i f f e r e n c e space w h e t h e r space y o u space t a k e space x space a n d space y space a s space 7 space a n d space 10 o r space 7 a space a n d space 10 a. B u t comma space i n space g e n e r a l space t h a t space w o n apostrophe t space b e space t h e space c a s e comma space S o space i t space i s space a d v i s a b l e space t o space e x p r e s s space apostrophe x apostrophe space a n d space apostrophe y apostrophe space a s space 7 a space a n d space 10 a. T h e n comma space y o u space c a n space s u b s t i t u t e space i n space t h e space e x p r e s s i o n space a n d space s i m p l i f y space t o space g e t space t h e space v a l u e. H o p e space t h a t space c l e a r s space y o u r space d o u b t. space space end style

Answered by satyajit samal | 13 Jun, 2016, 09:15: AM

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If x(b-c)+y(c-a)+z(a-b)=0, then prove that (bz-cy)/(b-c)=(cx-az)/(c-a)=(ay-bx)/(a-b) If the ratio of arithmetic mean of two numbers x and y to their geometric mean is p:q,then prove that x:y=p+

square root of p hat 2 minus q hat 2 end root

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square root of p hat 2 minus q hat 2 end root

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In a business, A invests Rs 50000 for 6 months; B Rs 60000 for 4 months and C Rs 80000 for 5 months. If they together earn Rs 18800, find the share of each.

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ICSE Class 10 Answered

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