Finding reaction load in truss with two point loads

[jellybellybea]

Homework Statement

http://i277.photobucket.com/albums/kk63/sarcasticlil123/truss.jpg

Homework Equations

p1=800#, p2= 600# and a=8, determine a reaction load

The Attempt at a Solution

sum Ma=0=-4.5p1-6p2+12.5cy
I am generally lost, this isn't homework its practice for the final exam. Could someone help?

 

[PhanthomJay]

Homework Statement

http://i277.photobucket.com/albums/kk63/sarcasticlil123/truss.jpg

Homework Equations

p1=800#, p2= 600# and a=8, determine a reaction load

The Attempt at a Solution

sum Ma=0=-4.5p1-6p2+12.5cy
I am generally lost, this isn't homework its practice for the final exam. Could someone help?

You've got it right. From your equation, you can solve for Cy. Then use sum of forces in x direction = 0, and sum of forces in y direction = 0, to solve for Ax and Ay. Note that Cx must be zero, since it is a roller support that is free to slide in the x direction, and thus, can support no load in that direction.