Question 168253
{{{7x+3y=5}}}-------------------> A          
{{{3x-22y=12}}}-----------------> B         
{{{2x-y=-1}}} ------------------> C
{{{x+2y=7}}} -------------------> D
In A:
{{{3y=5-7x}}} ---> {{{y=(5/3)-(7/3)x}}}
In B:
{{{22y=3x-12}}} ---> {{{cross(22)y/cross(22)=(3x-12)/22}}}
{{{y=(3/22)x-(12/22)}}} ---> {{{y=(3/22)x-(6/11)}}}
In C:
{{{y=2x+1}}}
In D:
{{{2y=7-x}}} ---> {{{cross(2)y/cross(2)=(7-x)/2}}}
{{{y=(7/2)-(x/2)}}}
See graph:
{{{drawing(400,400,-5,5,-5,5,graph(400,400,-5,5,-5,5,(5/3)-(7/3)x,(3/22)x-(6/11),2x+1,(7/2)-(x/2))))}}}
*Note: 
RED Line = A; GREEN Line= B; BLUE Line=C; PURPLE Line=D
.
Thank you,
Jojo