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Mathematics 16 Online
Razor:

Write the equation of this line in slope-intercept form.

Razor:

1 attachment
dude:

That image is so small, anyway what is the point that lies in the y-axis?

Razor:

XD Yeah sorry um, 5

dude:

Yes, so that is the y-intercept

dude:

Are you familiar with rise/run?

Razor:

Uhh Not really I don't know how to do it or..use it

silvernight269:

Y2-Y1 over X2-X1

dude:

^That works too but sometimes people find that complicated

dude:

\(\large \frac{y_2-y_1}{x_2-x_1}\)

Razor:

very o-o

silvernight269:

It’s called fractions.

Razor:

eeeeeeeeeeeeeee

dude:

silver, don't overestimate what people know, be nice

silvernight269:

I am nice. I mean it’s like saying 4/5: 4 over 5

dude:

select 2 points (preferably next to each other)1542166166-5beb969617002872e5461d00-image.png

Razor:

errrrrrrrrr.............what

Razor:

??

dude:

|dw:1542166270824:dw|

Razor:

What do you mean next to eachother lol

dude:

|dw:1542166277440:dw| Choose 2 points

Razor:

1 attachment
Razor:

those two

dude:

Okay

dude:

So start on the left point |dw:1542166424331:dw| How much does it have to go down to be in the same level as the other point?

Razor:

4?

dude:

Right! So that is your "rise" \(\large \frac{rise}{run}=\frac{-4}{??}\)

dude:

|dw:1542166565593:dw| How much does it have to go to the right?

Razor:

2?

dude:

Right, so we have slope = \(\large \frac{rise}{run}=\frac{-4}{+2}=-\frac{4}{2}\)

dude:

Slope intercept form is written as \(y=mx+b\) m is the slope b is the intercept Can you substitute what we know now into the equation?

Razor:

ahhhh

Razor:

hrm... 5 is the y intercept correct? OR iz there more than one

dude:

Yes, that was right

dude:

Lines only have 1 y-intercept

Razor:

okie.... so 5=b...um....what would the slope equal from what we did?

dude:

Yes

Razor:

would the slope equal um...the rise? I'm guessing

dude:

the slope is the fraction itself, the same thing

Razor:

okay... y =-4/2 + 5

Razor:

I'm like totally wrong though o-o

dude:

That's right, just remember to add the x \(y=-\frac{4}{2}x+5\)

dude:

(Also note that 4/2 is 2)

Razor:

-gasp- .... okay y = -4/2x + 5... or y = -2x +5 .. that's the answer? Or iz there more O.O Su exciting

dude:

\(y = -2x +5\) Is the final simplified form xD

Razor:

ohh XDD

dude:

Yeh

Razor:

I can use either one of those?

dude:

Use \(y = -2x +5\)

Razor:

okie thankssssssssssssssssssssssssssssssssssssss much blessings and thankz ^^

dude:

Haha, no problem

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