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31 December, 12:22

Solving for systems of equations by substitution.

Y=4x

X+y=5

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Answers (1)
  1. 31 December, 12:47
    0
    Since the first equation already gives you y, substitute Y for 4x in the second equation.

    y=4x

    x+y=5

    x + (4x) = 5

    5x=5

    x=1

    Now that you know x, plug in x for 1 in the first equation.

    y=4 (1)

    y=4

    Answer: (1,4)
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