Hi

solve the following system by graphing)finding were the lines intersect)

x-3y=9   OR y = (1/3)x - 3  Slope = 1/3 and y intercept is Pt(0,-3) Green

x+3y= -3 OR y = (-1/3)x - 1 Slope = -1/3 and y intercept is Pt(0,-1)Blue

Lines interscet at Pt(3,-2), this ordered pair is the solution for this system

CHECKING our Answer***

x-3y=9   

x+3y= -3

2x = 6,  x = 3 and y = -2  (y = (1/3)x - 3 )



 

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
 x-3y=9

x+3y= -3



solve equation by graphing 

--------------

x-3y=9 --> x = 3y + 9

x+3y= -3 --> x = -3y - 3

------------

The graphs are straight lines, so 2 points are needed

x = 3y + 9

Pick 2 values for y and find x

y = 0, x = 9 --> (9,0)

y = -3, x = 0 --> (0,-3)

Plot those 2 points and draw a line thru them.

----------------

Do the same for the other equation.

Where the 2 lines intersect is the x & y values that fit both equations.

That's the solution to the system.



 

RELATED QUESTIONS

Can you help me solve this Linear Combination Equation?
-2x+3y=-9... (answered by ewatrrr)

Please help me solve this equation by graphing - 5X + Y = -9
                             (answered by MathLover1)

I need some help on this problem,  Can someone show me what the graph looks like.  I am... (answered by tutorcecilia)

Solve problem by graphing x+3y=-9 ,... (answered by Alan3354)

Can you help me to solve these two equation by using elimination and substitution method.
 (answered by richwmiller)

Hi!!!!!!

I have been having trouble with graphing, I sorta stubbled across this site.... (answered by checkley71)

I am so lost with this graphing stuff, can you please help me with this one? 
2x + 3y =... (answered by wowkids38)

I am lost, please help
solve the system by addition
3x-2y=17... (answered by jim_thompson5910)

I am having so mush trouble trying to figure out first what to do with this problem, I... (answered by ewatrrr)