Question 675745
{{{ 2x + y = 4 }}}
Subtract {{{ 2x }}} from both sides
{{{ y = -2x + 4 }}}
The slope is {{{ -2 }}} and the y-intercept is {{{ 4 }}}
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A negative slope means the line is down on the 
right and up on the left.
If you move plus {{{ 1 }}} along the x-axis,
you must then move minus {{{ 2 }}} on the y-axis
to have slope =  {{{ -2 }}}
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Here's the plot:
{{{ graph( 400, 400, -10, 10, -10, 10, -2x + 4 ) }}}