Help pleaseee algebra 1- ill give you a lot of medals and ill fan if you help me

- anonymous

Help pleaseee algebra 1- ill give you a lot of medals and ill fan if you help me

- katieb

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- Godlovesme

ok i think graphing would be the easiest way to do this :D
do u have geogebra app?

- Godlovesme

@blahhedup101 u there?

- anonymous

yeah im here

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- anonymous

- anonymous

and no i dont have a graphing app

- Godlovesme

hmm is it fine if i graph it and u determine how many solutions the line will have? solution is just the intersection so it's easy :)

- anonymous

ok sounds good :)

- Godlovesme

great! :D
so first are u familliar with the slope-intercept formula?

- Godlovesme

y= mx + b ?

- anonymous

sorry my mom was talking to me

- anonymous

but yes i am familiar with y=mx+b

- Godlovesme

it's cool :)
so i guess you know that m stands for slope and b represents the y-intercept

- anonymous

yes

- Godlovesme

awesome! so if two lines have the same slope, it means thy are parallel. And if two lines are parallel, they will NEVER intersect which means there will be no solution
so do u see any lines with the same slope?

- anonymous

oh ok that makes sense and idk i dont know how to graph them

- Godlovesme

no we dont need to graph it if we find any two equations that have the same slope
for example y= 3x +1 and y= 3x +2 have the same slope,3 so the lines are parallel so there is no solution ( they will never intersect)
make sense?

- anonymous

ohhhhhhhhh

- anonymous

ok ummm

- anonymous

what about the last on is that no solution?

- Godlovesme

so if u look at the first pair, you can tell that they have the same slope because -x is the same thing as -1x

- anonymous

and the second last one is no solution

- Godlovesme

hold on we're on the first one

- Godlovesme

y= -x -2
y= -x -6
do this equations have the same slope? ^^

- anonymous

um no

- Godlovesme

um actually they do, look -x means -1x so we will have
y= -1x -2
y= -1x -6
they both have a slope of -1

- anonymous

ohhh... i thought they didnt because of the 2 and the 6

- Godlovesme

that's the y-intercept , the slope is the one with x :)

- anonymous

i dont get these they are very confusing sooo the numbers dont count ?

- Godlovesme

sorry about the confusion :/
butt here
y=mx+b
we will be given numbers for m and b like
y= 2x + 3
m = slope
b= y-intercept
so in this case our slope is 2 and the y-intercept is 3
got it?

- Godlovesme

|dw:1433841887514:dw|

- Godlovesme

@blahhedup101 was that confusing?

- anonymous

idk i just suck at everything that has to do with graphs and slopes :/

- Godlovesme

no it's okay
just remember m represents slope and b represents y-intercept okay

- anonymous

but youre explaining everything very well :)

- anonymous

thanks for not leaving :)

- Godlovesme

my pleasure dear (:

- Godlovesme

ok so can u remember that m means slope
and b means y-intercept ?please :DD
sorry if i sound rude

- anonymous

yes ma'am i remember

- anonymous

im just confused about how do you know if its one solution or infinity

- Godlovesme

we'll get there but for now you have to know how to determine the slope and y-intercept |dw:1433842646745:dw|

- Godlovesme

so if m is slope then whats the slope in the above equation?

- anonymous

2

- Godlovesme

YES!! :DDDD *high fives* great job! :D
what about the y-intercept?

- anonymous

3... i understand all of that

- Godlovesme

oh okay so now do u understand why i said the first two pairs have the same slope?

- anonymous

the y=-x-2 ?

- Godlovesme

yes

- anonymous

yess

- Godlovesme

awesome so since they are parallel they will be included in the "no solution" section :)
got it?

- anonymous

yeahh is the next one 1 solution ?

- Godlovesme

YES! awesome job! :D

- anonymous

is the rest 1 solution?

- Godlovesme

no the third one is different and maybe the rest as well
for the 3rd one we have y=3x+4 and 2y=6x+8
lets change 2y= 6x+8 in to y=mx+b form by dividing 2 from both sides
2y/2 = 6x/2 + 8/2
y= 3x+4
now we have the SAME equation! :O
this means the lines have infinitely many solutions

- anonymous

ohhh

- Godlovesme

was that confusing?

- anonymous

not the way you explained it but if i were to do it by myself id be lost

- Godlovesme

im glad :D
let's move to the fourth one
we have y=-3 and x= -6
one sec, i'll post the screenshot of what the graph will look like

- anonymous

ok :)

- Godlovesme

http://prntscr.com/7f1e2v
so how many intersections do u see? :P

- Godlovesme

i mean where the blue and red line intersects

- anonymous

is that 1 solution?

- Godlovesme

yes, you're doing great! :DD
take a look at the last one
http://prntscr.com/7f21uy

- anonymous

one solution

- Godlovesme

YAYY! WE'RE DONE AND AWESOME JOB!! :DDD

- anonymous

:) so its supposed to look like this?

##### 1 Attachment

- Godlovesme

yes :)

- anonymous

Thank youu so muccchhhhhhhhh

- Godlovesme

you're very welcome (:

- anonymous

have a nice dayyyy

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