Solving (5/4)x + (1/8)x = (3/8) + x, -(1/9)(x - 27) + ....

[mattjones]

I need some help with these 4 questions in a hurry...thank you soo much!!

1.

2.

3.

4.

 

[Deleted member 4993]

Re: Solving Equations PLEASE HELP URGENT

I need some help with these 4 questions in a hurry...thank you soo much!!

1.

2.

3.

4.

Please share with us your work/thoughts - exactly where you are stuck - so that we know where to begin to help you.

 

[mattjones]

Re: Solving Equations PLEASE HELP URGENT

Ok with #1 I think I have to multiply both sides by 8 correct? (LCD) but I am having trouble doing so...

 

[Deleted member 4993]

Re: Solving Equations PLEASE HELP URGENT

Ok with #1 I think I have to multiply both sides by 8 correct? (LCD) but I am having trouble doing so...

correct

tell me

5/4 * 8 = ???

1/8 * 8 = ???

3/8 * 8 = ???

1 * 8 = ???

 

[mattjones]

Re: Solving Equations PLEASE HELP URGENT

10x+x=3+8x is that right?

 

[mattjones]

Re: Solving Equations PLEASE HELP URGENT

Ok I got #1...Im pretty sure the answer is 1 ...thanks for the help

 

[Deleted member 4993]

Re: Solving Equations PLEASE HELP URGENT

10x+x=3+8x is that right?

Correct

now isolate the variable (x) - that is all the terms with 'x' attached to it on side of equation and all the terms without 'x' on the other side of the equation.

 

[Deleted member 4993]

Re: Solving Equations PLEASE HELP URGENT

Ok I got #1...Im pretty sure the answer is 1 ...thanks for the help <<< correct

See you did know how to do it.

generally, if the problem says "solve" - you can check your answer:

5/4 * x + 1/8 * x = 3/8 * x + x

5/4 * 1 + 1/8 *1 = 3/8 * 1 + 1

(10+1)/8 = (3+8)/8

11/8 = 11/8 <<< checks

 

[mattjones]

Re: Solving Equations PLEASE HELP URGENT

For #2 do I do the distrubutive property first?

 

[mmm4444bot]

Re: Solving Equations PLEASE HELP URGENT

For #2 do I do the distrubutive property first?

YES.

This is true for #2, #3, and #4.

With equations that look similar to these, we always start by using the distributive property to get rid of the parentheses.

~ Mark

 

[Deleted member 4993]

Re: Solving Equations PLEASE HELP URGENT

For #2 do I do the distrubutive property first?

I would still multiply by 9 first - then distribute.

But if you feel comfortable - you could distribute first and just handle the rest as fractions.

 

[Denis]

Re: Solving Equations PLEASE HELP URGENT

3.

With this type, easier if you first get rid of decimals; multiply each term by 100:
18(6) + 3x = 6(6 + x)

 

[mmm4444bot]

Re: Solving Equations PLEASE HELP URGENT

For #2 do I do the distrubutive property first?

I would still multiply by 9 first - then distribute.

But if you feel comfortable - you could distribute first and just handle the rest as fractions.

Of course! I would multiply by 9 first, too. (Those fractions didn't register when I glanced back because I did not do anything with problem #2; STUDENTS NOTE: This is an example of what can happen when you say something about something without first actually doing it.)

~ Mark