Question

graph the line 5x+2y-8=0

Answer 1

have you ever before graphed the line ?
or found the intercepts ?

Answer 2

no i need help changing it to the y=mx+b format. I get really confused with these problems.

Answer 3

ok, after changing it to y=mx+b format, will u be able to graph the line ?

Answer 4

yea

Answer 5

to get that into y=mx+b format
you just need to isolate y

you can start by adding 8 on both sides, what u get ?

Answer 6

Yea I get 5x+2y+8 right

Answer 7

*=

Answer 8

yes,
5x+2y=8
is correct

now there's also x term with the y
5x is added to it, so next step would be to SUBTRACT 5x from both sides,
what u get ?

Answer 9

2y+3x?

Answer 10

=

Answer 11

nopes...
you can't subtract a constant term with x term

5x+2y = 8

subtracting 5x from both sides,
2y = 8-5x

got this ?

Answer 12

Or 2y+8-5x?

Answer 13

Oh okay and after that I should subtract 2 from each side?

Answer 14

y=-5x+6?

Answer 15

nopes, 2 is MULTIPLIED with y
so to get rid of it, you should DIVIDE 2 on both sides...
makes sense ?

Answer 16

y=-5x+4?

Answer 17

now divide 2 on both sides of
2y =8-5x

Answer 18

divide 2 on each term

Answer 19

y=-5/2x+4?

Answer 20

yes! correct :)

Answer 21

thats in y=mx+b format :)

Answer 22

okay thanks can you help me with factoring?

Answer 23

sure

Answer 24

I understand some but not all. For example, p^2+7p+10

Answer 25

find 2 numbers whose sum is +7
and product is 10

Answer 26

5 and 2?

Answer 27

correct!
so, break up 7x as 5x+2x

Answer 28

x^2 +5x+2x+10 = 0

now what can you factor out from 1st 2 terms ?

Answer 29

Okay this is where I get very confused.

Answer 30

ok,

x^2 mean x*x
right ?

Answer 31

Yes

Answer 32

so,
what do u see common in
x*x + 5*x ??

Answer 33

They all have an x?

Answer 34

yup,
so factor out x
you would do
x^2 + 5x = x (x+5)
got this ?

Answer 35

Yes

Answer 36

good,
so now what about
2x+10 ??
note 10 = 2*5

Answer 37

I would divide 2?

Answer 38

when you see a common factor, just bring that out...like this

2x+2*5

2 is common
so,
2x+10 = 2 (x+5)
got it ?

Answer 39

Yes so it would be (5+p)(2+p)?

Answer 40

good!
absolutely correct :)

Answer 41

Okay Thanks! I have one more problem if it's not a bother?

Answer 42

no bother....
just that, next time, ask new Q in new post :)

Answer 43

Alright. And so the problem is a little long, it's an exponential problem. I usually get these but this one is different. The world population in 2005 was 6.2 billion and growing exponentially at a rate of 1.14% per year. the function P(t)=6.2(10^0.005t) provides a good model for the population growth pattern. In this model what does P(t) represent and what does t represent

Answer 44

Also says Explain how you can be sure that this function givesthe correct popuation in 2005

Answer 45

eh....i am not so good at this,
can you ask this in new post...some1 will surely help u :)

Answer 46

Alright thanks for everything though.