Question 93920
First each equation must be solved for y, then graph the equations.

3x-6y=9
6y=9-3x
{{{y=(-1/2)x+3/2 }}}

x-2y=3
-2y=-x+3
{{{y=(1/2)x-3/2 }}}

Then graph
{{{ graph(300,300,-5,5,-5,5,(-1/2)x+3/2,(1/2)x-3/2)}}}

Your solution is the intersection of the two lines. Fyi, the lines are perpendicular because each slope is the opposite.

This gives (3,0) as your answer.