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anonymous

  • 4 years ago

Which of the following is a solution for the system y = -3x + 5 and y = 2x + 5? Oh man.. :(

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  1. anonymous
    • 4 years ago
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    The choices available: A. (1, 7) B. (5, 0) C. (2, -1) D. (0, 5)

  2. Mertsj
    • 4 years ago
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    Why don't you just plug the points into the equations and see which point makes both sentences true?

  3. anonymous
    • 4 years ago
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    So like just -3(1)+5 and 2(7)+5? And so on?

  4. Mertsj
    • 4 years ago
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    Just about

  5. Mertsj
    • 4 years ago
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    I will show you an example

  6. anonymous
    • 4 years ago
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    Alright, sounds good!

  7. Mertsj
    • 4 years ago
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    |dw:1327009156150:dw|

  8. anonymous
    • 4 years ago
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    I still don't understand this problem. How do I know what I am looking for?

  9. Mertsj
    • 4 years ago
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    Well we have just shown that the first point is not the right one. So now plug in the second one and see if it makes the sentence true.

  10. anonymous
    • 4 years ago
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    What are the equations supposed to equal though?

  11. Mertsj
    • 4 years ago
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    The equation says y = -3x+5

  12. Mertsj
    • 4 years ago
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    So when you replace y with 7 and x with 1 it is supposed to make a true sentence like 7 = 7

  13. anonymous
    • 4 years ago
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    I know that but what is the number it is supposed to equal? :/ Urg :/

  14. Mertsj
    • 4 years ago
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    Whatever number y is in that ordered pair.

  15. anonymous
    • 4 years ago
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    You would want to keep doing what Mertzj told you to do until you end up with the same number on both sides of the = . That means that that data point you used is correct. In the instance given 7 and 2 do not equal. That's why it was wrong.

  16. Mertsj
    • 4 years ago
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    |dw:1327009603748:dw|

  17. Mertsj
    • 4 years ago
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    See. It is supposed to equal 0. So plug in 5 for x and see if you get 0

  18. anonymous
    • 4 years ago
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    -3(5)+5=10 is what I got..

  19. Mertsj
    • 4 years ago
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    So that point isn't the one either. move on to the third choice.

  20. anonymous
    • 4 years ago
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    My answer is C. (2, -1) because in both equations they equal the same.

  21. Mertsj
    • 4 years ago
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    |dw:1327009731857:dw|

  22. Mertsj
    • 4 years ago
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    Good job!!!

  23. anonymous
    • 4 years ago
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    Thanks!! :)

  24. Mertsj
    • 4 years ago
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    yw

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