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28 April, 16:30

Show how to use substitution or elimination to solve the following system of equations. Write the solution as an ordered pair.

4x - y = 10

y = 2x - 2

+2
Answers (2)
  1. 28 April, 17:51
    0
    x=4

    y=6

    Step-by-step explanation:

    4x - y = 10

    y = 2x - 2

    4x - (2x-2) = 10

    4x-2x+2=10

    2x+2=10

    2x=8

    x=4

    Subsitute into equation 4x-y=10

    16-y=10

    y=6
  2. 28 April, 19:30
    0
    {4, 6}.

    Step-by-step explanation:

    4x - y = 10

    y = 2x - 2

    You can just add these 2 equations and y will be eliminated:

    4x - y + y = 2x + 10 - 2

    4x = 2x + 8

    2x = 8

    x = 4

    Substitute x = 4 into the first equation:

    4 (4) - y = 10

    y = 16 - 10 = 6.
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