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14 July, 23:12

What is solution 7x+5y=-24 and 4x+y=42?

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Answers (2)
  1. 15 July, 01:30
    0
    7x+5y=-24 (1)

    4x+y=42 (2)

    multiply equation (2) by 5 to get

    20x+5y=210 (3)

    then calculate (3) - (2) which gives you

    13x=234 hence x=18

    then substitute for x in either equation to get y=-30
  2. 15 July, 02:08
    0
    { 7x + 5y = - 24

    { 4x + y = 42 ⇒ y = 42 - 4x

    7x + 5y = - 24

    7x + 5. (42 - 4x) = - 24

    7x + 210 - 20x = - 24

    7x - 20x = - 24 - 210

    - 13x = - 234. (-1)

    13x = 234

    x = 234

    13

    x = 18

    4x + y = 42

    4. (18) + y = 42

    72 + y = 42

    y = 42 - 72

    y = - 30

    S = { 18, - 30 }
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