5x-6y=9=0
3x+4y=25
find x and y using substitution method

1 thought on “5x-6y=9=0<br /> 3x+4y=25 <br /> find x and y using substitution method”

1. Answer:

   5x-6y-9=0. (1 equation)

   3x+4y-25=0. (2 equation)

   Multiplying equation 2 by 5 and equation 1 by 3 we get,

   15x-18y-27=0. (3 equation)

   15x+20y-125=0. (4 equation)

   Now, Solving equations 3 & 4 by substitution method

   Substracting equation 4 from 3, we get,

   15x-18y-27=0

   -15x-20y+125=0

   x portion will be cancelled out and remaining is

   -38y+97=0

   38y=97

   y=2.55

   Substituting the value of y in equation 1 we get,

   5x-6×2.55-9=0

   5x-24.3=0

   5x=24.3

   x=4.86

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