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MathematicsMathematics
25 June, 17:58

Y=x+5

4x+y=20

Solving system by substitution

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Answers (1)
  1. 25 June, 18:13
    0
    Y = x + 5 ... so we sub in x + 5 for y in the other equation

    4x + y = 20

    4x + x + 5 = 20

    5x + 5 = 20

    5x = 20 - 5

    5x = 15

    x = 15/5

    x = 3

    y = x + 5

    y = 3 + 5

    y = 8

    solution is (3,8)
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