will you please show me a graph
-8, -11

- anonymous

will you please show me a graph
-8, -11

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- anonymous

u mean graph that coordinate?

- anonymous

(-8, -11)?

- anonymous

It is just a point 8 units left of the x/y axis, 11 units down

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- anonymous

yepp :) agreed with rickjbr!

- anonymous

|dw:1327679050325:dw|

- anonymous

I have to show each system by graphing.
its y = 3x =3
y = x-3
The answer is -8, and -11.
But what does the graph look like to this
I need to show the arrows

- anonymous

You plug in values for x and solve for y. Then you draw a line through two or more points. You only need 2 points to draw the line, however.

- anonymous

Therefore, Rick what does the graph look like

- anonymous

Why do you say y=3x=3?

- anonymous

Is there one equation or more?

- anonymous

What is the equation you are trying to graph?

- anonymous

No its y=3x+13
Y=x-3 im sorry

- anonymous

You need to graph two lines?

- anonymous

i know but how

- anonymous

For my anwer for my graph i got -8,-11

- anonymous

You have equations in the form of y=mx+b
m is the slope, b is the y-intercept, which is where the line will intersect the y axis

- anonymous

ok and then i graph it right? what would that look like

- anonymous

What you need to do is plug in two values for x for each equation, then draw a line through the points (x1, y1) and (x2, y2)

- anonymous

ok can you show my i am really having troble with this

- anonymous

so for y=3x+13, you can plug in 1 for x and 2 for x
When you plug in 1, y will be 16. When you plug in 2, y will be 19.
So plot two points (1,16) and (2,19) and draw a line through them

- anonymous

Another way to do this is to only put in one point and then use the slope. In y=3x+13, the slope is 3/1 (the m in y=mx+b)

- anonymous

ok thanks alot you really help!!!

- anonymous

Then for every 1 unit you increase x, y will increase by 3 units.

- anonymous

You're welcome

- anonymous

Do you understand now?

- anonymous

yep thanks : )

- anonymous

Sure thing.

- anonymous

well, wait - I draw the graph, it doesn't look right. What would yours look like

- anonymous

I'll try to draw one for you y=3x+13

- anonymous

Actually i'll draw y=x-3 so i don't have to draw so many hashes

- anonymous

|dw:1327680173064:dw|

- anonymous

You see how in y = x-3, the line intersects the y axis at (0,-3)? That's because in y=mx+b, b is the y intercept. The line will cross the y axis at the y intercept

- anonymous

in y = x-3, b = -3

- anonymous

the slope (m) is 1/1, so for every 1 unit increase in x, y increases only 1 unit as well

- anonymous

Did your graph for y = x-3 look anything like that?

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