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 1182219: Find the x value so that the line through the points (x,-9) and (0,1) has a slope of -4.
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

given:
the points (x,-9) and (0,1)
a slope of m=-4

m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29
-4=%281-%28-9%29%29%2F%280-x%29
-4=%281%2B9%29%2F%28-x%29
-4=10%2F%28-x%29
-4%28-x%29=10
4x=10
x=10%2F4
x=5%2F2
x=2.5