Question 322298
{{{ -6x+y=20 }}} 
{{{y=6x+20}}} 
Plot it.
{{{drawing(300,300,-6,2,-6,2,grid(1),graph(300,300,-6,2,-6,2, 6x+20))}}}
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{{{-4x+y=12 }}} 
{{{y=4x+12}}} 
Plot it too.
{{{drawing(300,300,-6,2,-6,2,circle(-4,-4,.2),grid(1),graph(300,300,-6,2,-6,2, 6x+20,4x+12))}}}
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Looks like (-4,-4) is a solution.
Verify using both equations.
{{{-6x+y=20 }}} 
{{{-6(-4)+(-4)=20}}} 
{{{24-4=20}}} 
{{{20=20}}} 
True
{{{-4x+y=12}}} 
{{{-4(-4)+(-4)=12}}} 
{{{16-4=12}}} 
{{{12=12}}} 
True
The ordered pair solves both equations, it's a good solution.