Answers

2014-11-01T19:58:37+08:00
X + y = 7500    -----equation 1
2.5x + 3.25y = 3  -----equation 2
dividing equation 2 with 2.5
[2.5x + 3.25y = 3]  ÷ 2.5
x + 1.3y = 1.2   -----equation 2'
subtract equation 2' from equation 1
     x +   y    = 7500
-   x + 1.3y = 1.2
          -0.3y = 7498.8
                y = -24996
substitute y=-24996 to equation 1
x + y = 7500
x +(-24996) = 7500
x = 7500 + 24996
x = 32,496
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