SOLUTION: (2,4),(x,8)m=-2 how do you find x or y?

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: (2,4),(x,8)m=-2 how do you find x or y?       Log On


   

Question 272054: (2,4),(x,8)m=-2
how do you find x or y?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
m=(y2-y1)/(x2-x1)
(2,4),(x,8)m=-2
-2=(8-4)/(x-2)
-2=4/(x-2) cross multiply
-2(x-2)=4
-2x+4=4
-2x=4-4
-2x=0
x=0
(2,4),(0,8) ans.
4=-2*2+b
4=-4+b
b=4+4+8 the Y intercept.
y=-2x+8
+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+-2x+%2B8%29+ (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -2x +8)