Kitkat1
  • Kitkat1
Medal for best answer!!! Part A: Explain why the x-coordinates of the points where the graphs of the equations y = 4−x and y = 2x + 3 intersect are the solutions of the equation 4−x = 2x + 3. Part B: Make tables to find the solution to 4−x = 2x + 3. Take the integer values of x between −3 and 3. Part C: How can you solve the equation 4−x = 2x + 3 graphically?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Kitkat1
  • Kitkat1
@foolofatook
foolofatook
  • foolofatook
part a makes no sense.
foolofatook
  • foolofatook
im not good with graphs

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Kitkat1
  • Kitkat1
Can u answer the 2nd part?
Kitkat1
  • Kitkat1
I was mostly confused with the 2nd part
foolofatook
  • foolofatook
ok
foolofatook
  • foolofatook
lets start with plugging in the lowest number and go up
Kitkat1
  • Kitkat1
4-(1)=2(1)+3 3=5 false 4-(2)=2(2)+3 2=7 false 4-(3)=2(3)+3 1=9 false 4-(4)=2(4)+3 4=3 false 4-(5)=2(5)+3 5=1 false 4-(6)=2(6)+3 6=1 false 4-(7)=2(7)+3 7=-3 false
Kitkat1
  • Kitkat1
this is what i did but dont know how that will help me find the answer
foolofatook
  • foolofatook
the question says the values are between -3 and 3
foolofatook
  • foolofatook
4−-3 = 2*-3 + 3.
Kitkat1
  • Kitkat1
4-(-3)=2(-3)+3 7=3 false
anonymous
  • anonymous
A. We have two lines: y = 2-x and y = 4x+3 Given two simultaneous equations that are both required to be true.. the solution is the points where the lines cross... Which is where the two equations are equal.. Thus the solution that works for both equations is when 2-x = 4x+3 because where that is true is where the two lines will cross and that is the common point that satisfies both equations.
foolofatook
  • foolofatook
srry doing two things at once
foolofatook
  • foolofatook
4−-2 = 2*-2 + 3 ?
Kitkat1
  • Kitkat1
@kaitlynfisher You made a mistake it is actually y=4-x and y=2x+3
anonymous
  • anonymous
Solving it graphically: You just insert the functions and see where they cross:
1 Attachment
Kitkat1
  • Kitkat1
4-(2)=2(2)+3 2=7 false
foolofatook
  • foolofatook
4−-1 = 2*-1 + 3.
Kitkat1
  • Kitkat1
5=1 false
foolofatook
  • foolofatook
4-0=2*0+3.?
Kitkat1
  • Kitkat1
4=3 false
foolofatook
  • foolofatook
4−1 = 2*1 + 3.
Kitkat1
  • Kitkat1
3=5 false
foolofatook
  • foolofatook
4−2 = 2*2 + 3.
Kitkat1
  • Kitkat1
2=7 false
Kitkat1
  • Kitkat1
How is this going to help me find the answer?
foolofatook
  • foolofatook
it seems there are no whole number answers
Kitkat1
  • Kitkat1
Then what is the answer?
anonymous
  • anonymous
The answer is \[x=\frac{1}{3}\] So it doesnt work trying with whole numbers.
Kitkat1
  • Kitkat1
how do I explain that?
Kitkat1
  • Kitkat1
Okay it is x=1/3 how can that be explained?
foolofatook
  • foolofatook
write it as a decimal, 0.33 repeating, wich means it has a line over the threes
foolofatook
  • foolofatook
4−(0.33) = 2(0.33) + 3.
anonymous
  • anonymous
You see from this table, that is would be between 0 and 1. Then you would start taking like 1/4, 2/4, 3/4 and then you would find that it is between 1/4 and 2/4, this way you could find the answer using a table.
1 Attachment
Kitkat1
  • Kitkat1
3.67=3.66 false
Kitkat1
  • Kitkat1
Okay whatever what about the part C?
foolofatook
  • foolofatook
this stupid graph... i dont know @Tommynaiter ?
Kitkat1
  • Kitkat1
Okay well I have 2 more questions I will give u a medal now and post it in a different thread can u come and help me with them?
foolofatook
  • foolofatook
sure. tag me
Kitkat1
  • Kitkat1
Okay

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