Can you help me... I WILL GIVE MEDALS!!!
What is the equation of the graphed linear model?
y = x +

- anonymous

Can you help me... I WILL GIVE MEDALS!!!
What is the equation of the graphed linear model?
y = x +

- jamiebookeater

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- anonymous

##### 1 Attachment

- 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

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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## More answers

- anonymous

Is the slope-2?

- 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

Are you able to complete the linear equation from here?

- anonymous

is it y=x+(-2)?

- 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

So, y = -2x + b

- anonymous

Can you tell me what b is?

- anonymous

I got -50

- 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

yes

- anonymous

Using this information, are you able to complete the equation?

- anonymous

idk can u help me more?

- anonymous

Sure. Can you tell me what is confusing you?

- anonymous

Well I must be doing something very wrong... I keep getting -50.

- anonymous

For b

- anonymous

@IParke ?

- 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

?. Sorry I'm blanking. Can I get another hint?

- anonymous

R u there?

- anonymous

|dw:1433907329394:dw|

- anonymous

|dw:1433907399077:dw|

- 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

yes. is it 110?

- 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

It is 110 :)

- anonymous

Do you know algebra?

- anonymous

Not really

- anonymous

Thank You so much!!

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