The costs (in dollars) of a repair call taking x hours or fraction thereof from companies A and B are, respectively, C1(X) = 20x + 40 and C2(X) = 10x + 50 (a) Graph C1 and C2 on the same set of axes. Graph Layers After you add an object to the 9 can use Graph Layers to view a properties. @ E WebAssign. Graphing Tool Submission Data (b) For how many hours is the cost the same for either company? hr