Question 128882
If you know how to do one, you know how to do them all.


Step 1:  Pick a value for x.  It doesn't matter what it is, so make it something that makes the arithmetic easy, like 0 or 1.


Step 2:  Substitute that value into your equation and then calculate what y must be for that value of x.


{{{3x-y=9}}}


If you picked 0 for x, then:
{{{3(0)-y=9}}}
{{{-y=9}}}
{{{y=-9}}}

So when x is 0, y is -9.

Now, repeat steps 1 and 2 using a different value for x.  Let's do it with x = 1.

{{{3(1)-y=9}}}
{{{-y=9-3}}}
{{{-y=6}}}
{{{y=-6}}}


So, when x is 1, y is -6.


Now, take these pairs of numbers that you developed and put them into ordered pair form:  (0,-9) and (1,-6).


Plot these two points on your graph.  Then draw a line through the points and you are done.


{{{drawing(400,400,-5,6,-10,1,
grid(1),
graph(400,400,-5,6,-10,1,3x-9),
circle(0,-9,.1),
circle(1,-6,.1),
locate(.2,-9.3,P1(0,-9)),
locate(1.2,-6.3,P2(1,-6))
)}}}



Follow this same procedure for the other problems.