LifeIsADangerousGame
  • LifeIsADangerousGame
How do I do this equation?
Mathematics
schrodinger
  • schrodinger
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LifeIsADangerousGame
  • LifeIsADangerousGame
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UnkleRhaukus
  • UnkleRhaukus
if the equation is of the form y=mx+b then b is the y intercept, ie 3
Mertsj
  • Mertsj
A

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Mertsj
  • Mertsj
y intercept is 2 1/2
LifeIsADangerousGame
  • LifeIsADangerousGame
I don't really understand how to get the equation..
UnkleRhaukus
  • UnkleRhaukus
and the gradient is negative ( slopping down across x
Mertsj
  • Mertsj
If you notice, there are two points that are marked on the graph. One is (-1,3) the other is (5,0). Use those two points to find the slope.
Mertsj
  • Mertsj
Can you do that?
LifeIsADangerousGame
  • LifeIsADangerousGame
Yea, so that means it's -3/6?
Mertsj
  • Mertsj
Yes. Reduce that to -1/2
Mertsj
  • Mertsj
Now use point-slope form and plug in the slope and one of the points to find the equation.
Mertsj
  • Mertsj
Can you do that?
Mertsj
  • Mertsj
Based on the answer choices, you might want to use the point (-1,3)
LifeIsADangerousGame
  • LifeIsADangerousGame
I don't really understand this last part, do I put it in one of the equations on the screen or a whole seperate one?
Mertsj
  • Mertsj
Here is point-slope form:
LifeIsADangerousGame
  • LifeIsADangerousGame
y = mx + b right?
Mertsj
  • Mertsj
\[y-y _{1}=m(x-x _{1)}\]
LifeIsADangerousGame
  • LifeIsADangerousGame
oh
Mertsj
  • Mertsj
replace m with -1/2 which is the slope. Replace x1 with -1 and y1 with 3 because you are using the point (-1,3)
LifeIsADangerousGame
  • LifeIsADangerousGame
so y - 3 = -1/2(x + 1)?
Mertsj
  • Mertsj
Exactly. Isn't that one of the choices?
LifeIsADangerousGame
  • LifeIsADangerousGame
Yea! It's A! Thanks Mertsj! Wish I could give you more than one medal.. :/
Mertsj
  • Mertsj
Thank you. Glad to help. Now do a couple more problems like this so you really learn it!
LifeIsADangerousGame
  • LifeIsADangerousGame
Thanks again :)
Mertsj
  • Mertsj
yw

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