Mathematics

Question

I have a series of 2 questions.
I have a series of 2 questions.
I have a series of 2 questions.

1 Answer

  • 1)
    I:y=3x-4
    II:9x-3y=14


    substitute y into II:
    9x-3*(3x-4)=14
    9x-9x+12=14
    12=14

    this is obviously not equal so there is no solution, the lines are parallel

    2)
    I:y=4x+6
    II:5x-y=6

    substitute y into II:
    5x-(4x+6)=6
    5x-4x-6=6
    x=12
    substiute x into II:
    5*12-y=6
    -y=6-60
    -y=-54
    y=54

    the solution is (12,54)
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