Intermediate Algebra

Solve using elimination method. If the system has no system or infinite number of solutions, state this. Please show all work. I need to show how I came about my answer. I need this as soon as possible please. I would appreciate any and all help!!

2x+2y=20

2x-2y=4

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  1. add the equations, and get...

    4x=20 or x=5, then figure y

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    bobpursley
  2. 2x+2y=20
    2x-2y=4
    _________
    4y= 16

    y=16
    2x+2(40)=20
    2x+8=20
    2x=12
    x=6
    (x,y)= (6,4)

    Is this correct???

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  3. how would one know whether the answer is correct?

    Plug your values for x and y into both equations and see whether the equations hold.

    In this case, your answer is correct.

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