anonymous
  • anonymous
help ( attached below)
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous

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Directrix
  • Directrix
The y-intercept is where the graph cuts the y-axis. Read that point from the graph and post here. Then, we'll have to figure the slope.
anonymous
  • anonymous
-3
Directrix
  • Directrix
Okay. We'll use the slope-intercept form of the equation of a line: y = mx + b where b is the y-intercept and m is the slope.
Directrix
  • Directrix
So far, we have y = mx -3. One way to think about slope is the change in y over the change in x. @elexusvanderhorst How have you been computing slope? We'll do what you already know although I'm thinking we can read the slope off the graph. Tell me what you think.
anonymous
  • anonymous
ive always been confused on how to do slope
Directrix
  • Directrix
We'll read it from this graph. I'll post a diagram shortly. Before that, recall that slope has to do with the rate of change of y with respect to x. If the slope of a line is 5 over 7, then that means every time x moves 7 units to the right, the corresponding value of y moves up 5 units.
Directrix
  • Directrix
For a line, slope is constant. In this problem, as x moves 2 to the right, y goes up by 1. So, the slope is 1/2. So, what is the equation of the line in y = mx + b form? Recall that you already found the intercept (So far, we have y = mx -3) .
Directrix
  • Directrix
Look at the diagram for a "picture" of slope.
anonymous
  • anonymous
y=1/2x-3
anonymous
  • anonymous
omg dude I <3 ur pic
anonymous
  • anonymous
me?
anonymous
  • anonymous
@alahrichi1 thanks i love one direction
anonymous
  • anonymous
no santa claus
anonymous
  • anonymous
me 2 fanned u becuz of it
anonymous
  • anonymous
lol thanks
Directrix
  • Directrix
@elexusvanderhorst yes for y=1/2x-3. I might write it as y = (1/2) x - 3. I <3 ur pic --> I thought she was talking about my diagram.
anonymous
  • anonymous
@Directrix thank you for your help
Directrix
  • Directrix
Glad to help.

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