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OpenStudy (anonymous):
What is the y-intercept of the line?
y=-2x-8
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OpenStudy (secret-ninja):
The equation for graphing is
y=mx+b
and the "+b" is the y intercept.
whether it is positive or negative, makes it goes upward or downward.
OpenStudy (secret-ninja):
What do you think is the y intercept?
OpenStudy (anonymous):
6
OpenStudy (anonymous):
The y-intercept is where the line crosses the y-axis, meaning what is the value of y when x =0?
OpenStudy (secret-ninja):
You don't have to solve anything, it is already in the equation. |dw:1418752846301:dw| See?
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OpenStudy (secret-ninja):
So what is your y intercept?
OpenStudy (secret-ninja):
|dw:1418752988827:dw|
Directrix (directrix):
To get on the y-axis, the x value has to be 0. Take the equation y=-2x-8 and substitute 0 for x. y = -2*0 - 8 = 0 - 8 = ? @_Invalid._.user
OpenStudy (anonymous):
8
Directrix (directrix):
What is 0 - 8 = ?
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OpenStudy (anonymous):
-8
Directrix (directrix):
Yes. The y-intercept is -8. The point coordinates can be written as (0, -8)
OpenStudy (secret-ninja):
Good job! :D
OpenStudy (anonymous):
OpenStudy (anonymous):
whats the slope, slope= and whats the why intersect
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