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http://westada.org/cms/lib8/ID01904074/Centricity/Domain/2795/2.4.pdf

It's the second page 17

so we're given y = mx + b, and we want to solve for b
subtract mx from each side to get b by itself

I have to subtract 3x on each side

where are you getting 3 from?

It's on question 13

I thought you wanted question 17?

No I need help on all of them

ok, let's start with 13 then

so we have 3x + 5y = 30, so yes, we would start by subtracting 3x from each side

5y = 30 - 3x, do you know where to go from there?

|dw:1443140077390:dw|

subtract 3x on both sides

right, so that gives us
5y = 30 - 3x, now keep going

|dw:1443140208422:dw|

like that ?

uh, not quite. we want y by itself, but we have 5y, so we divide everything by 5

5y = 30 - 3x
y = (30-3x)/5

The answer is 5.4

|dw:1443140424012:dw|

uh, not quite, you just stop when you get
y = (30-3x)/5

the question asked us to get y, and we got y, so y = (30-3x)/5 is our final answer

is that suppose to be dividing before 5

yes

For the next the first step is 6y=360-24x

I thinks I did it wrong

because it says for x

yeah, so we want x by itself
start by subtracting 6y from both sides

24x=6y-360 like that <-

almost
24x = 360 - 6y
now we want x by itself, so we divide both sides by 24
x = (360-6y)/24

Do I just put the equation or do I have to solve it

that's it, our answer is x = (360-6y)/24

oh okay

The next one is hard

start by multiplying both sides by 32

It starts 1280-80d=32c

good, now subtract 1280 from both sides

Do i also subtract 1280 to 80 or 32 ?

nope, since 80 and 32 are attached to variables (letters) we leave them alone

-80d = 32c - 1280
divide both sides by -80 now

It's -1328

oh so thats the equation

I need help on question 16

multiply both sides by (9/5) first

or 5/9

nope, we want to multiply by (9/5) to get rid of the (5/9)

oh okay

idk what would be the equation

I'm struggling

(9/5)C = F - 32
now add 32 to both sides

I add 32 to 32 and 9/5

nope, leave the 9/5 alone since its attached to c
(9/5)C + 32 = F

So the equation would be 9/5c+32=f

yes, or you can flip it around to get
F = (9/5)C + 32

For the next questions is not even using numbers ?

y = mx + b
subtract mx from both sides

just treat mx like a number

Is it y=(mx-b)

uh, not quite
y - mx = mx + b - mx
now keep going

you cancel out mx

good, so that leaves us with
y - mx = b
and since the question wants b by itself, we're done

b = y - mx

ok, last one
Ax + By = C
start by subtracting Ax from both sides

Isn't it y=c/b-a/b*x

Thank you so much sorry for bothering you all the time

almost, Y = C/B - A*x/B
and don't apologize, you aren't a bother :)