Question 3392
  
  3x - 2.5y = 7.125     ....  (1)
  2.5x - 3y = 7.3125    ....  (2)
by multiplying eq.(1) by 2.5, we get
  7.5x - 6.25y = 17.8125 ...  (3)
similarly eq.(2)*3, we get
  7.5x - 9y = 21.9375   ....  (4)
now, eq.(4)-(3), we get
  -2.75y = 4.125
So  y  =  {{{4.125/-2.75}}} = -1.5
replacing the value of this y in eq.(1)
  3x -{{{2.5*(-1.5)}}} = 7.125
= 3x - (-3.75) = 7.125
= 3x + 3.75 = 7.125
= 3x = 7.125 - 3.75 = 3.375
So x = {{{3.375/3}}} = 1.125


x = 1.125;  y = -1.5    Answer.


gsm