MATH

posted by Anonymous

If (x,7) is a solition to the equation 5x-y=3, what is the value of x?

  1. SAM

    5X-Y=3
    -5X -5X
    -Y=3-5X
    DIVIDE BY -1 ON BOTH SIDES
    Y=-3+5X
    PLUG IT IN PLUG IT IN
    7=3-5(X)
    SOLVE
    SUBTRACT BY 3 ON BOTH SIDES 4=5X
    AND DIVIDE BY -5 ON BOTH SIDES 4/5=5/5X
    4/5=X

  2. SAM

    CORRRECTION!!!!
    -4/5!

  3. X

    Here, all you have to do is substitute (7) for (y) in the equation. You can do this because all coordinates are of the form (x,y), and any number that is in the place of (y) in this format can be seen as equal to (y).
    The working is shown below:
    5x - (7) = 3
    5x = 10
    x = 2
    As shown in the working above, x = 2 when y = 7.

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