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31 July, 13:23

Which of the following ordered pairs represents the solution to the system given below?

2x + y = 20

4x - 2y = 40

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Answers (2)
  1. 31 July, 13:42
    0
    Multiply the 1st row by 2

    4x+2y=40

    4x-2y=40

    Subtract the 2nd row from the 1st row

    4y=0

    Solve for y in the above equation

    4x+2*0=40

    Solve for x in the above equation

    x = 10

    y = 0
  2. 31 July, 13:46
    0
    first divide equation 2 by 2 just to work with smaller numbers. add the new equation to the first. the y's will cancel out. 4x = 40 so x = 10 from equation 1 2x + y = 20 and x = 10 so replace x with 10 and find y
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