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30 September, 20:28

What should be the first step in adding these equations to eliminate y

8x+3y = 2

+ 4x-by=-7

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Answers (1)
  1. 30 September, 23:57
    0
    Step-by-step explanation:

    Are you sure you wanted that "b" in the second equation?

    If so, here's how we eliminate y:

    1) Multiply the first equation by b: 8bx + 3by = 2b

    2) Multiply the second equation by 3: 12x - 3by = - 21

    3) Combine these two results. We get:

    (8b + 12) x = 2b - 21

    Here we have eliminated y, but still have an equation in two variables, b and x.
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