anonymous
  • anonymous
Can you help me... I WILL GIVE MEDALS!!! What is the equation of the graphed linear model? y = x +
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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anonymous
  • anonymous
Remember that the equation of a linear function is: y = mx + b Where m is the slope of the line and b is the y-intercept.
anonymous
  • anonymous
b is easiest to solve here, it's the y-value where the line crosses the y-axis. In other words, it's the y-value of x=0.

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anonymous
  • anonymous
Is the slope-2?
anonymous
  • anonymous
The slope of the line is equal to the rise and run between two points. I will choose two points: (0, 110) and (20, 70). The rise is: 70 - 110 = -40. The run is: 20 - 0 = 20. Rise/Run gets us: -40/20 = -2. So you are correct.
anonymous
  • anonymous
Are you able to complete the linear equation from here?
anonymous
  • anonymous
is it y=x+(-2)?
anonymous
  • anonymous
Sorry, but that is not correct. y = mx + b Simply substitute the variable m for your numeric slope value and replace b with the y-intercept :)
anonymous
  • anonymous
So, y = -2x + b
anonymous
  • anonymous
Can you tell me what b is?
anonymous
  • anonymous
I got -50
anonymous
  • anonymous
The y-intercept is where the line crosses the y-axis. Can you see that the line crosses the y-axis at y=110?
anonymous
  • anonymous
yes
anonymous
  • anonymous
Using this information, are you able to complete the equation?
anonymous
  • anonymous
idk can u help me more?
anonymous
  • anonymous
Sure. Can you tell me what is confusing you?
anonymous
  • anonymous
Well I must be doing something very wrong... I keep getting -50.
anonymous
  • anonymous
For b
anonymous
  • anonymous
@IParke ?
anonymous
  • anonymous
Sorry about that. Are you solving for b algebraically? The y-intercept (b) is the value of y when x=0. Since we've already found the slope, we have the equation: y = -2x + b, correct? So what is y equal to when our x = 0?
anonymous
  • anonymous
?. Sorry I'm blanking. Can I get another hint?
anonymous
  • anonymous
R u there?
anonymous
  • anonymous
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anonymous
  • anonymous
|dw:1433907399077:dw|
anonymous
  • anonymous
I am sorry if I am being confusing. Let's start over and take it slow. I'm going to assume that you know how to do slope since you did that so well.
anonymous
  • anonymous
yes. is it 110?
anonymous
  • anonymous
You got -2 for the slope value. The slope value is m. In our equation for a line: y = mx + b, we can replace m with the -2 you found for slope.
anonymous
  • anonymous
It is 110 :)
anonymous
  • anonymous
Do you know algebra?
anonymous
  • anonymous
Not really
anonymous
  • anonymous
Thank You so much!!

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