4x = 5y + 10 z = y – x 3x + 4y = 20 + z?

solve

4x = 5y + 10

z = y – x

3x + 4y = 20 + z

answers:

(5, 2, 3)

(5, 2, -3)

(2, 5, -3)

(2, 5, 3)

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