Question 440320

{{{x+y=45}}}....{{{x=45-y}}}

{{{11x+10y=0 }}}
-----------------------add

{{{12x+11y=45}}}

{{{12(45-y)+11y=45}}}

{{{540-12y+11y=45}}}

{{{540-y=45}}}

{{{540-45=y}}}

{{{495=y}}}


{{{x=45-y}}}

{{{x=45-495}}}

{{{x=-450}}}

check:

{{{11(-450)+10*495=0 }}}

{{{-4950+4950=0 }}}

{{{0=0 }}}


{{{x+y=45}}}

{{{-450+495=45}}}

{{{45=45}}}


graph:

{{{y=45-x}}}

{{{y=11x/10=1.1x }}}

{{{ graph(500, 500, -500, 500, -500, 500, 45-x, 1.1x) }}}