Identify the points (x1,y1)from the equation y-9=3(x+2)

  and 

The formula for point slope form is:



In the equation y-9=3(x+2), 9 is equal to 

to find  we need to do a bit more work. 

in the formula,  is subtracted from x. In the equation given 2 is added to x. we can rationalize that  must have been a negative number, since subtracting a negative number is equivalent to adding a positive number. The equation, before being simplified must have looked similar to this:

y- 9=3(x-(-2))
and was then converted to
y-9=3(x+2)

so  and