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26 November, 12:01

2x+8y=6, - 5x-20y=-15

need work because I don't understand

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Answers (1)
  1. 26 November, 14:24
    0
    Infinitely many solutions.

    Step-by-step explanation:

    Step: Solve 2x + 8y = 6 for x:

    2x + 8y = 6

    2x + 8y + - 8y = 6 + - 8y (Add - 8y to both sides)

    2x = - 8y + 6

    2x/2 = (-8y + 6) / 2 (Divide both sides by 2)

    x = - 4y + 3

    Step: Substitute - 4y + 3 for x in - 5x - 20y = - 15:

    -5x - 20y = - 15

    -5 (-4y + 3) - 20y = - 15

    -15 = - 15 (Simplify both sides of the equation)

    -15 + 15 = - 15 + 15 (Add 15 to both sides)

    0 = 0
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