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17 February, 08:45

Solve 3x + 5y = 27.5

2x + 3y = 16

By elimination. What is the solution?

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Answers (1)
  1. 17 February, 09:02
    0
    3x+5y=27.5 ... (1)

    2x+3y=16 ... (2)

    multiply (1) by 2 and (2) by 3

    6x+10y=55 ... (3)

    6x+9y=48 ... (4)

    subtract (4) from (3)

    6x+10y-6x-9y=55-48

    y=7

    from (2)

    2x+3 (7) = 16

    2x=16-21

    2x=-5

    x=-5/2=-2.5
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