Y=4x-7
16x-5y=25
 

Asked by Meher | 5th Jul, 2017, 06:05: PM

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 | 6th Jul, 2017, 07:41: AM