anonymous
  • anonymous
Which of the following is a solution for the system y = -3x + 5 and y = 2x + 5? Oh man.. :(
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
The choices available: A. (1, 7) B. (5, 0) C. (2, -1) D. (0, 5)
Mertsj
  • Mertsj
Why don't you just plug the points into the equations and see which point makes both sentences true?
anonymous
  • anonymous
So like just -3(1)+5 and 2(7)+5? And so on?

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Mertsj
  • Mertsj
Just about
Mertsj
  • Mertsj
I will show you an example
anonymous
  • anonymous
Alright, sounds good!
Mertsj
  • Mertsj
|dw:1327009156150:dw|
anonymous
  • anonymous
I still don't understand this problem. How do I know what I am looking for?
Mertsj
  • Mertsj
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.
anonymous
  • anonymous
What are the equations supposed to equal though?
Mertsj
  • Mertsj
The equation says y = -3x+5
Mertsj
  • Mertsj
So when you replace y with 7 and x with 1 it is supposed to make a true sentence like 7 = 7
anonymous
  • anonymous
I know that but what is the number it is supposed to equal? :/ Urg :/
Mertsj
  • Mertsj
Whatever number y is in that ordered pair.
anonymous
  • anonymous
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.
Mertsj
  • Mertsj
|dw:1327009603748:dw|
Mertsj
  • Mertsj
See. It is supposed to equal 0. So plug in 5 for x and see if you get 0
anonymous
  • anonymous
-3(5)+5=10 is what I got..
Mertsj
  • Mertsj
So that point isn't the one either. move on to the third choice.
anonymous
  • anonymous
My answer is C. (2, -1) because in both equations they equal the same.
Mertsj
  • Mertsj
|dw:1327009731857:dw|
Mertsj
  • Mertsj
Good job!!!
anonymous
  • anonymous
Thanks!! :)
Mertsj
  • Mertsj
yw

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