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3 March, 16:54

What is the answer for this one?

4x+3y=20 2x+y=7

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Answers (1)
  1. 3 March, 19:17
    0
    x = 1/2, y = 6

    Explanation:

    Step 1 - Align the equations and multiply the second row by 2

    4x + 3y = 20

    2x + y = 7

    4x + 3y = 20

    4x + 2y = 14

    Step 2 - Subtract them both

    4x + 3y = 20

    4x + 2y = 14

    y = 6

    So, y = 6

    Step 3 - Substitute y into the first equation

    4x + 3y = 20

    4x + 3 (6) = 20

    4x + 18 = 20

    Step 4 - Subtract 18 from both sides

    4x + 18 = 20

    4x + 18 - 18 = 20 - 18

    4x = 2

    Step 5 - Divide both sides by 4

    4x = 2

    4x / 4 = 2 / 4

    x = 2/4

    So, x = 1/2
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