anonymous
  • anonymous
Write a rule for the linear function in the graph.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
the lines are (4,3) (3,-1)
anonymous
  • anonymous
A. y =-4 x + 13 B. y = -4x – 13 C. y =4 x – 13
theEric
  • theEric
Do you know the general "point-slope" formula?\[y=mx+b\] Are you familiar with that?

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anonymous
  • anonymous
no
theEric
  • theEric
Alright, well this formula is how you define a line! For a line, the "m" and "b" variables will be numbers instead. "m" is "slope" and "b" is "y-intercept" Are either of those familiar to you? And are you familiar with plotting points on a graph using a formula?
anonymous
  • anonymous
|dw:1346091835332:dw|
theEric
  • theEric
I can immediately answer your problem, but I want to work it throug with you.
theEric
  • theEric
And I agree with your plot! :)
anonymous
  • anonymous
yes i would like that
anonymous
  • anonymous
You do not really need to do all this for a multiple choice question.
anonymous
  • anonymous
Just replace in the 3 equations and see which one works
anonymous
  • anonymous
C would be the answer.
theEric
  • theEric
eliassaab is correct. eliassaab recommends that you take the x value of one point and put it into the equation, you should get the y value of that point from calculating the correct option.
theEric
  • theEric
There's another quick method to determine if a formua might be right, just by looking to see if "m" and "b" are positive on your plot and then finding the choice that has those same positive or negatives. That requires a little knowledge of how it works anyway. Wold you like to work through this as if there are no multiple choices?
theEric
  • theEric
That would be helpful for both finding the answer without choices, and understanding the concept some more in a different way than the substitution method of eliassaab.
anonymous
  • anonymous
thank you
theEric
  • theEric
Would you like to work through it as if there were no multiple choice, then? :) eliassaab's method will work every time for multiple choice, though.
theEric
  • theEric
By looking at a picture with no points, you can narrow down the possible equations. By going through some algebra, you can find the equation by knowing any two points on the line.
anonymous
  • anonymous
no thank you but i need more help with other questions
theEric
  • theEric
Alright. I'll look for them on here! :)
theEric
  • theEric
And C is the answer, as eliassaab said :)
anonymous
  • anonymous
thanks =)
theEric
  • theEric
No problem!!

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