SOLUTION: Find the x value so that the line through the points (x,-9) and (0,1) has a slope of -4.

Algebra ->  Linear-equations -> SOLUTION: Find the x value so that the line through the points (x,-9) and (0,1) has a slope of -4.       Log On


   

Question 1141141: Find the x value so that the line through the points (x,-9) and (0,1) has a slope of -4.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+%28+1+-%28-9%29+%29+%2F+%28+0++-+x+%29+=+-4+
This is [ change in y ] / [ change in x ] = slope
+10+%2F+%28-x%29+=+-4+
+10+=+-4%2A%28-x%29+
+10+=+4x+
+x+=+2.5+
--------------------
Check answer:
+10+%2F+%28+0+-+2.5+%29+=+-4+
+10+=+10+
OK