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8 December, 07:43

Solve this 3x + 4y = 8 & 4.5x + 6y=12

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Answers (2)
  1. 8 December, 09:42
    0
    3x+4y=8

    4y=-3x+8

    divide both sides by 4

    y=-3/4x+2

    plug y=-3/4x+2 in 3x+4y=8

    -> 4.5x+6 (-3/4x+2) = 12

    4.5x-9/2x+12=12

    decimal 9/2x=4.5x

    4.5x-4.5x+12=12

    x=0

    plug x=0 in 3x+4y=8

    4y=8

    y=2
  2. 8 December, 09:49
    0
    Multiply the first equality by 3/2 and you get the second

    There are thus an infinite number of solutions : x can be any number and y=2-3x/4
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