isuckatschool43
  • isuckatschool43
Can anyone help? I will fan and medal.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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isuckatschool43
  • isuckatschool43
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anonymous
  • anonymous
One characteristic of a function is that it's independent variable (in most cases, x) never repeats. Take a look at A. Do you spot any repeating x-values? @isuckatschool43
isuckatschool43
  • isuckatschool43
no

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anonymous
  • anonymous
Really? So you're saying that (-1, 1) and (-1, 3) do not possess the same x-value? Hint: (x, y)
isuckatschool43
  • isuckatschool43
oh i see that okay
anonymous
  • anonymous
Since this solution set has a repeating x-value, it fails the vertical line test and therefore, is not a function. A is not one of your choices.
anonymous
  • anonymous
Now, take a look at D. Can you spot any repeating x-value? @isuckatschool43 Hint: The left-hand column are all x-values.
isuckatschool43
  • isuckatschool43
no
anonymous
  • anonymous
Then D is one of your answers.
anonymous
  • anonymous
Let's take a look at B. Can you draw a vertical (up-and-down) line through the blue line without crossing it twice? @isuckatschool43
isuckatschool43
  • isuckatschool43
yes
anonymous
  • anonymous
Then the graph in B passes the vertical line test, and therefore is a function. B is one of your answers.
anonymous
  • anonymous
Now for C, it takes longer to explain fully, but it's also one of your answers. You basically have to be familiar with cubed curves.
isuckatschool43
  • isuckatschool43
okay thanks so much @Cardinal_Carlo can you help me with a couple more?
isuckatschool43
  • isuckatschool43
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isuckatschool43
  • isuckatschool43
Have you actually been typing for 42 minutes @Cardinal_Carlo
anonymous
  • anonymous
Nope I actually left for nearly an hour.
isuckatschool43
  • isuckatschool43
oh wow it said you were typing lol
isuckatschool43
  • isuckatschool43
so i dont really know what to do
anonymous
  • anonymous
Where are you now?
isuckatschool43
  • isuckatschool43
i havent really gotten anywhere im stumped
anonymous
  • anonymous
Let's see, \[m _{A} = \frac{ 13-7 }{ 5 - (-1) } = \frac{ 6 }{ 6 } = 1\] \[7 = 1(-1) + b\] \[7 = -1 + b\] \[8 = b\] \[line ~A ~~~is ~~y = x + 8\] \[m _{B} = \frac{ (-7) - 29 }{ 6 - (-6) } = -\frac{ 36 }{ 12 } = -3\] \[-7 = -3(6) + b\] \[-7 = -18 + b\] \[11 = b\] \[line ~~B ~~is ~~y = -3x + 11\] So we just need to equate these two equations to find our point of intersection. \[x + 8 = -3x + 11\] \[4x = 3\] \[x = \frac{ 3 }{ 4 }\] The only choice that has an x = 3/4 is B. We don't have to go further to find y-values since we already found a definitive x-value. B is our best answer @isuckatschool43
anonymous
  • anonymous
I apologize for taking that long.
isuckatschool43
  • isuckatschool43
thats no problem thank you

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