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8 July, 01:53

What is the result of subtracting the second equation from the first?

-20 + 7y = 10

3x + 7y = 2

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Answers (2)
  1. 8 July, 02:38
    0
    The result is that you eliminate the 7y term and thus can solve for x.

    x = - 28/3

    y = 30/7

    Step-by-step explanation:

    -20 + 7y = 10

    3x + 7y = 2

    subtract ... elimination method

    -20 - 3x = 8

    -3x = 28

    x = - 28/3

    -20 + 7y = 10

    7y = 30

    y = 30/7
  2. 8 July, 02:57
    0
    Answer: - 4x-2y-x+2y=-5x=-11

    Step-by-step explanation:

    We have to remember when subtracting equations that we can only subtract like terms. This means that we can only subtract x from - 4x, - 2y from - 2y and 9 from - 2. If we do this, we obtain the equation - 5x + 0=-11. This is because - 4x-x=-5x. When subtracting a negative, we add the term so - 2y - - 2y becomes - 2y + 2y, which cancels to 0. - 2-9=-11. - 11/-5 is 2.2, the value of x.
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