<p>SYMMETRY
so if a graph is symmetrical with respect to the origin or symmetrical with respect to the y-axis then the y intercept is always 0 right ?</p>
<p>not necessarily. it depends on what kind of graph you're talking about</p>
<p>an example for symmetrical with respect to the origin: y=sinx
with respect to y-axis: not necessarily. y-intercept = 0 --> means the origin is on the graph, it doesn't say anything about symmetrical...</p>