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14 April, 17:02

Solve:

2y + 5x=30

y = 3x + 4

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Answers (1)
  1. 14 April, 18:15
    0
    Replace the second equation y=3x+4 into the first one:

    2 (3x+4) + 5x=30

    Now solve for x:

    6x+8+5x=30

    11x=30-8

    11x=22

    x=22/11

    x=2

    Finally, replace x=2 into y=3x+4

    y=3*2+4

    y=6+4 = 10

    So the anwer is x=2, y=10
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