Question 308741
Y-intercept: The value of y when x=0 (at what y value does the graph cross the y axis). 
{{{y=x+3}}}
{{{y=0+3}}}
{{{y=3}}}
The y-intercept is then (0,3).
 {{{ drawing( 300, 300, -5, 5, -5, 5, grid(1),circle(0,3,.2),graph( 300, 300, -5, 5, -5, 5, x+3)) }}} 
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Similarly the X-intercept: The value of x when y=0 (at what x value does the graph cross the x axis). 
{{{0=x+3}}}
{{{x=-3}}}