Question 261576
Both equations are lines. To plot the lines, pick a value for x and then find y by using the equation.
For instance, given {{{ 2x-y=3}}}
Pick any x. let's pick x=0.
Now plug that value for x into the equation and solve for y
{{{2*0 -y = 3}}}
{{{-y = 3}}}
{{{y = -3}}}
Now plot that point (0,-3)
In order to plot a line, you need two points.
So pick another x, let's say x=1
{{{2*(1)-y = 3}}}
{{{2-y =3}}}
{{{-y = 1}}}
{{{y=-1}}}
So a second point is (1,-1). Plot that point,
Now draw the line that goes through both points
{{{graph(400,400,-10,10,-10,10,2x-3)}}}


Use the same process for the second equation. I am sure you can do it.

You asked, where do these numbers come from? Now you know, YOU pick them.

When you plot for second line, you'll see it intersects the first line at one point. 
{{{graph(400,400,-10,10,-10,10,2x-3, -3x-5)}}}