Question

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

y = x +

Answer 1

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.

Answer 2

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.

Answer 3

Is the slope-2?

Answer 4

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.

Answer 5

Are you able to complete the linear equation from here?

Answer 6

is it y=x+(-2)?

Answer 7

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 :)

Answer 8

So, y = -2x + b

Answer 9

Can you tell me what b is?

Answer 10

I got -50

Answer 11

The y-intercept is where the line crosses the y-axis. Can you see that the line crosses the y-axis at y=110?

Answer 12

yes

Answer 13

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

Answer 14

idk can u help me more?

Answer 15

Sure. Can you tell me what is confusing you?

Answer 16

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

Answer 17

For b

Answer 18

@IParke ?

Answer 19

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?

Answer 20

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

Answer 21

R u there?