Calculus

Is thsi a solution of an ordered pair
(4, -1)
4x = -17 - y
2x = -12 -4y
I say yes ?
Is this how you do it.

4(4) = -17 - -1 =
2(4) = -12 - 4(-1)

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  1. Yes, and it is a solution
    16 = 16
    and
    8 = 8
    well done !

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  2. Hey, wait a minute. I was not careful with signs
    16 is not -16
    and 8 is not -8
    I will solve the original in next post

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  3. 4x = -17 - y
    2x = -12 -4y
    Let's find the point where these lines really do cross.
    4 x = -17 -1 y
    4 x = -24 -8 y
    --------------
    0 x = 7 +7 y
    y = -1
    then
    2x = -12 -4 (-1)
    2 x = -8
    x = -4
    so the solution is actually
    (-4 , -1)

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  4. When you try that pair you will get
    -16 = -16
    and
    -8 = -8

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