Question 672386
Use the formula:
{{{ ( y - 5 ) / ( x - 0 ) = ( -7 - 5 ) / ( 4 - 0 ) }}}
{{{ ( y - 5 ) / x = ( -12 ) / 4 }}}
{{{ ( y - 5 ) / x = -3 }}}
{{{ y - 5 = -3x }}}
{{{ y = -3x + 5 }}}
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check: 
(4,-7)
{{{ y = -3x + 5 }}}
{{{ -7 = -3*4 + 5 }}}
{{{ -7 = -12 + 5 }}}
{{{ -7 = -7 }}}
(0,5)
{{{ 5 = -3*0 + 5 }}}
{{{ 5 = 5 }}}
OK