Question 1096270
<pre>
{{{drawing(2*19600/99,800,-4.9,4.9,-9.9,9.9,
grid(1),

circle(-2,-9,.1),circle(-1,-5,.1),circle(0,-1,.1),circle(1,3,.1),circle(2,7,.1),  
locate(-3.5,-9,"(-2,-9)"), locate(-2.7,-5,"(-1,-5)"),locate(0,-1,"(0,-1)"),
locate(1,3,"(1,3)"), locate(2,7,"(2,7)"),green(line(-9,-37,13,51))



)}}}

Yes, the green line shows that they all seem to lie on a straight line.

To find its equation,

1. Pick any two of the points, substitute in the slope formula:

{{{m}}}{{{""=""}}}{{{(y[2]-y[1])/(x[2]-x[1])}}}

2. Substitute that value of m and one of the points in the
   point-slope formula:

   y - y<sub>1</sub> = m(x - x<sub>1</sub>)

   Do not substitute anything for x and y.  Leave them as letters.

3.  Simplify and solve for y.

You finish.

Edwin</pre>