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Solve the following system:
{8 x+9 y = 48 |     (equation 1)
12 x+15 y = 21 |     (equation 2)
Swap equation 1 with equation 2:
{12 x+15 y = 21 |     (equation 1)
8 x+9 y = 48 |     (equation 2)
Subtract 2/3 × (equation 1) from equation 2:
{12 x+15 y = 21 |     (equation 1)
0 x-y = 34 |     (equation 2)
Divide equation 1 by 3:
{4 x+5 y = 7 |     (equation 1)
0 x-y = 34 |     (equation 2)
Multiply equation 2 by -1:
{4 x+5 y = 7 |     (equation 1)
0 x+y = -34 |     (equation 2)
Subtract 5 × (equation 2) from equation 1:
{4 x+0 y = 177 |     (equation 1)
0 x+y = -34 |     (equation 2)
Divide equation 1 by 4:
{x+0 y = 177/4 |     (equation 1)
0 x+y = -34 |     (equation 2)
Collect results:
Answer: | 
| {x = 177/4
y = -34

Assuming that you just want to simplify

5(w - 1/5) - w(9)

Simplify

5w - 5 - 9w

Simplify again

-4w - 5

And that's your answer :)

Solve the first equation for 'y' and substitute that value in the SECOND equation to get 'x'

8x + 9y =48

9y = 48 - 8x

y= (48-8x)/9

then    12x + 15y = 21 

            12x + 15 (48-8x)/9 = 21

             12x + 80 -13.33333x = 21

1.33333x = 59

x=44.25       y=(48-8x)/9 = -34

28 ÷ 1/8

Turn 28 into a fraction

28/1 ÷ 1/8

Use the reciprocal

28/1 x 8/1

Multiply

224/1

Simplify

224

-1  and 18     difference is 19      (18 - (-1))

Depends..... does your table go all the way to 'z' and then wrap around?  Or does it continue on past 'z' with new lettering scheme? Or does it wrap around at 'g'  ?

A light year is the DISTANCE light travels in one year.  If you have Light Year in MILES units you can conver to KILOMETERS by multiplying by 1.609344

Wow....could be ANY two consecutive integers    say   3 and 4      sqrt (20.25)      say 7 and 8   sqrt (56.25)    etc

15 pages/2 hours = 7.5 pages/hr

3/4 ÷ 7/8

Use the reciprocle

3/4 x 8/7

Multiply

24/28

Simplify

6/7

Just to explain how to solve it

Assuming you mean the seperate equations:

6y + 4 = 2(3y - 5)

Simplify

6y + 4 = 6y - 10

Subtract 6y from both sides

4 = -10

No solution

20f + (-8f - 15) = 2(4f - 5)

Simplify

20f -8f - 15 = 8f - 10

Simplify again

12f - 15 = 8f - 10

Subtract 8f from both sides

4f - 15 = -10

Add 15 to both sides

4f = 5

Divide by 4 on both sides

f = 4/5

3(1 + 2f) - 5 = 6f - 2

Simplify

3 + 6f - 5 = 6f - 2

Subtract 6f from both sides

3 - 5 = -2

Simplify

-2 = -2

Add 2 to both sides

0 = 0

Infinite Many Solutions

7x + 5 = 10(x - 7) - 3x

Simplify

7x + 5 = 10x - 70 - 3x

Simplify

7x + 5 = 7x - 70

Subtract 7x from both sides

5 = -70

No Solution

I'm not entirely sure this is correct, but I hope this helps :)

About 563.333333333333333333333333...

can be simplified to just 563.3

It equals 6/7.

I personally am not very good at explaining things, so here are two websites that might help :)

Purplemath

http://www.purplemath.com/modules/strtlneq2.htm

Khan Academy

https://www.khanacademy.org/math/algebra/two-var-linear-equations-and-intro-to-functions/point-slope/v/idea-behind-point-slope-form

good

14/5 = 2.8

3/4=.75         7/8 = 0.875

            .75/.875 = 0.8571428571428571

        simplify to:  .86

The side  = 56/4   = 14

And the diagonal of a square is sqrt(2) times as long as the side....so....

The diagonal =  14*sqrt(2)   = about 19.8

12 + 1/3   =   37/3

3 + 4/5  =      19/5

8 + 1/5  =      41/5

So....before lunch you bagged

(37/3)(19/5)  = 703/15 lbs

And after lunch you bagged

(37/3) (41/5)  = 1517/15 lbs

Adding these  we get   [703/15 + 1517/15]    = 148 lbs

A second way to do it is to combine both procedures into one

(37/3) [ 703/15 + 1517/15]     =  (37/3) [ 2220 / 15]   = 148 lbs

8 - x < 2   U  3x ≤ 9

For the first add x to both sides and subtract 2 from both sides

6 < x    or  x > 6

For the second, divide both sides by 3

x ≤ 3

So, in interval notation, the answers are

( - infinity , 3 ] U (6 , infinity )

You should be able to do the number line part.......here's a resource to help with that : http://www.coolmath.com/algebra/07-solving-inequalities/03-interval-notation-01

set up 1/$9=x/$350 solve for x by cross multiplying which will give you 9x=350 then divide both sides by 9 which will give you your answer

x^2-6*x=0   factor

x ( x - 6)  = 0      set each factor to 0

x = 0           and       x - 6 = 0       add 6 to both sides      x = 6

And there are your two answers......

910

If I am in a remotely bad mood and you multiple post like this.  I will Delete ALL copies of your question. 

I definitely will not answer ANY of them!!

So behave yourself and don't do it again !!!

We can answer this with a proportion :

6.5 / 33.2 = h / 51.5     where h is the elephant's height....cross-multiply

51.5 * 6.5   = 33.2 * h     divide both sides by 33.2

51.5 * 6.5 / 33.2  = h =  about 10.08 ft