Question 452251
You measure {{{y}}} on the vertical axis
and {{{x}}} on the horizontal axis.
A straight line, as long as it has a slope other than
{{{0}}} or infinity, will reach infinitely far on both
the (+) and (-) x-axis and the (+) and (-) y-axis.
That means any number you plug in for {{{y}}}, you
will get an {{{x}}}, and any number you plug in for
{{{x}}}, you will get a {{{y}}}.
When the equation has the form {{{ y = mx + b }}},
{{{m}}} = slope and {{{b}}} is the y-intercept
The x-intercept is found by setting {{{ y = 0 }}}
{{{ 0 = x + 3 }}}
{{{ x = -3 }}} x-intercept
The slope is {{{ m = 1 }}}
Here's the plot:
{{{ graph( 400, 400, -10, 10, -10, 10, x + 3) }}}