Question 324984
You can graph them but you can't solve them, they're equations of lines or inequalities. 
There's nothing to solve for. 
Re-post if you have additional information. 
.
.
{{{highlight( 4x+6y=12)}}}
.
.
{{{graph(300,300,-10,10,-10,10,(12-4x)/6)}}}
.
.
{{{highlight(y<3x+1)}}}
.
.
*[invoke plot_any_inequality "y < 3x+1", -10, 10, -10, 10, 300, 300]
.
.
{{{highlight(y=(2/3)x-3)}}}
.
.
{{{graph(300,300,-10,10,-10,10,(2/3)x-3)}}}