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ICSE Class 9 Answered

 Y=4x-7
16x-5y=25
 
Asked by Meher | 05 Jul, 2017, 06:05: PM
answered-by-expert Expert Answer
begin mathsize 16px style space straight y equals 4 straight x minus 7 space space space..... left parenthesis asterisk times right parenthesis rightwards double arrow 4 straight x minus straight y equals 7 space space.... left parenthesis straight i right parenthesis 16 straight x minus 5 straight y equals 25 space space..... left parenthesis ii right parenthesis Multiply space left parenthesis straight i right parenthesis space by space left parenthesis negative 5 right parenthesis comma space and space add space the space resultant space to space left parenthesis ii right parenthesis. minus 20 straight x plus 5 straight y equals negative 35 space space space space 16 straight x minus 5 straight y equals 25 space space space space We space get comma minus 4 straight x equals negative 10 rightwards double arrow straight x equals 5 over 2 Substituting space this space value space in space left parenthesis asterisk times right parenthesis comma space we space get straight y equals 4 open parentheses 5 over 2 close parentheses minus 7 equals 10 minus 7 equals 3 Hence comma space straight x equals 5 over 2 space and space straight y equals 3. end style
Answered by Rebecca | 06 Jul, 2017, 07:41: AM

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