solve the system:   x - 3y = 5     2x + y = 4

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x - 3y = 5 ........(1)

2x + y = 4 ........(2)

using the eliminattion methos, multiply (2) by 3 and add to (1):

==> 7x = 17

==> x = 17/7

Now to calculate y, substiute in (2):

==> y= 4 - 2x

          = 4- 2(17/7)

           = (28 - 34)/7 = -6/7

==> y= -6/7

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