Question 642377
The x-intercept occurs where {{{ y = 0 }}}
The y-intercept occurs where {{{ x = 0 }}}
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There can be more than one x-intercept,
but there can be only one y-intercept
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Suppose you have the equation {{{ y = x^2 - 4 }}}
To find the x-intercept(s),
{{{ 0 = x^2 - 4 }}}
{{{ x^2 = 4 }}}
{{{ x = 2 }}}
{{{ x = -2 }}}
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And, to find the y-intercept,
{{{ y = 0^2 - 4 }}}
{{{ y = -4 }}}
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Here's the plot:
{{{ graph( 400, 400, -5, 5, -5, 5, x^2 - 4 ) }}}