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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.
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.
Is the slope-2?
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.
Are you able to complete the linear equation from here?
is it y=x+(-2)?
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 :)
So, y = -2x + b
Can you tell me what b is?
I got -50
The y-intercept is where the line crosses the y-axis. Can you see that the line crosses the y-axis at y=110?
Using this information, are you able to complete the equation?
idk can u help me more?
Sure. Can you tell me what is confusing you?
Well I must be doing something very wrong... I keep getting -50.
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?
?. Sorry I'm blanking. Can I get another hint?
R u there?
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.
yes. is it 110?
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.
It is 110 :)
Do you know algebra?
Thank You so much!!