x+3y=9
graph using slope and y-intercept

Question

x+3y=9
graph using slope and y-intercept

anonymous · Answer

Are you literally copy+pasting questions from your test?

parthkohli · Answer

http://wolframalpha.com or your human brain. Choose amongst them ;)

anonymous · Answer

at vf321, no

anonymous · Answer

@ParthKohli, thanks! I am always interested in websites that will help

parthkohli · Answer

You're welcome, but I really prefer the latter for practice.

anonymous · Answer

i agree

parthkohli · Answer

This is a linear equation--which makes a straight line.
What you have to do is fetch two points from which the line will pass through(or convert this equation into the standard equation of a straight line).

anonymous · Answer

$$x+3y=9$$
$$3y=-x+9$$
$$y=-\frac{1}{3}x+3$$ but it would be easier to graph $$x+3y=9$$ by finding the $x$ and $y$ intercepts, plotting the two points and connecting the dots

parthkohli · Answer

Then some kinda thing you have to remember:
1) y-intercept is y when x = 0.
2) slope is the change in y per change in x.

anonymous · Answer

@ParthKohli will show you how to find them, it is the easiest way in this example

anonymous · Answer

that is what I need to fi do is get the points to graph

mathslover · Answer

first of all find the x intercept : by putting y = 0 

what do you get ?:

x+3(0) = 9

parthkohli · Answer

Okay sir satellite.

1) Find $x$ when $y = 0$. This is your $x$-intercept.
2) Find $y$ when $x = 0$. This is your $y$-intercept.

anonymous · Answer

x=9

mathslover · Answer

good now find y intercept by putting x = 0

0 + 3y =9

parthkohli · Answer

That's right. The $x$-intercept is (9,0).

anonymous · Answer

y=3

mathslover · Answer

solve for y : 0 + 3y = 9

tell me what you get?

parthkohli · Answer

Righty right!

mathslover · Answer

good that is (0,3)

mathslover · Answer

now can u plot them on graph?

parthkohli · Answer

(9,0) and (0,3) are two points that the line will pass through, okay?

mathslover · Answer

the graph will be like this

parthkohli · Answer

Just make these points, and make a straight line through them.

anonymous · Answer

thank you all for simplifying

parthkohli · Answer

You're welcome! 
I always like to help... :)

mathslover · Answer

Welcome and best of luck for your journey here and there (slope-intercept)

anonymous · Answer

can you all help me with another more complicated problem?

mathslover · Answer

ok

mathslover · Answer

post that as a new question

parthkohli · Answer

All right. Please try some of it by yourself.

anonymous · Answer

(-3,-1) slope is 2/3.  I need to graph