Question 63213
1. {{{ x+2y=-5 }}}
2. {{{ x =2y-1 }}}
plug 2 into 1
{{{ 2y-1+2y=-5 }}}
combine like terms
{{{ 4y -1 = -5 }}}
add 1 to both sides
{{{ 4y = -4 }}}
divide by 4
{{{ x = -1 }}}


Substitute this back into equation 1
{{{ -1 + 2y = -5}}}
add 1 to both sides
{{{ 2y = -4 }}}
divide by 2
{{{ y = -2 }}}


SOLUTION : ( -1 , -2 )