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1 July, 13:34

Solve.

{d+e=2

{d-e=4

Use the substitution method.

There are an infinite number of solutions.

There is no solution.

The solution is (5, 1).

The solution is (3, - 1).

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Answers (2)
  1. 1 July, 13:50
    0
    Adding up the two equations, we have

    2d=6

    Hence d=3

    Then the solution is (3, - 1)
  2. 1 July, 14:01
    0
    From 1st equation

    d + e = 2

    d = 2 - e

    From 2nd equation, subtitute d with 2 - e

    d - e = 4

    2 - e - e = 4

    2 - 2e = 4

    -2e = 2

    e = - 1

    Find d

    d = 2 - e

    d = 2 - (-1)

    d = 3

    The solution is (3,-1)
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