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Write the equation of the line in point-slope form.

 

 Sep 23, 2020
 #1
avatar+986 
+1

I'm not sure what "point slope" form is.

 

I'll give the form slope intercept.

 

y = ax+b

 

a is the slope, b is the y-intercept.

 

As we can see, the slope is (rise over run), and since the coordinates, (2,-1), and if you go up the next point on a grid is (1,1). Rise, 2, run, -1. 

 

Slope is thus -2.

 

y = -2x + b.

 

At a increase of slope 2, so for every 1 it goes left, it goes up 2.

 

We need to go left twice, so 2x2 = 4.

 

-1 + 4 = 3/

 

Thus the equation is

 

y = -2x + 3

 Sep 23, 2020
 #2
avatar+232 
+1

Point slope form:

y - y= m(x - x1)

 Sep 23, 2020

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