Any math experts out there? I need help badly!! please? :(

I can NOT get this answer no matter what I do. And it's irking me.

If anyone knows the answer, I'll love you for life and beyond. seriously.

Solve via the elimination method:

4x=18+2y
-6/5x + y=7/5

that's negative six over 5 with an x next to the fraction. Not 6x or 5x. It's 'fraction x" if you will.

thanks SO much for the help. We need minimum 80% to pass all homework, quizzes, pre tests, tests, pre finals, finals etc. or we can NOT move on.

The answer would be golden. I got (13,17) as the solution set, but we also can have 'infinitely many solutions' or 'the solution is the empty set' for the answer too.

reply to post by sarra1833


work:
solve for y
4x=18 +2y
4x -18=2y
2x - 9 =y

insert y to formula
-6/5x + y =7/5
-6/5x + (2x - 9)=7/5
-(6/5x)5 + (2x-9)5=(7/5)5
-6x+10x-45=7
-6x+10x=52
4x=52
x=13

2x-9=y
2(13)-9=y
26-9=y
17=y

x = y/2 + 9/2

x = - 5y/6 - 7/6

Yes you are right, x=13 y=17

I don't know what the above poster was doing.

P

I'm too tired to explain it right now. I was solving for X in fraction form.

Originally posted by pheonix358
Yes you are right, x=13 y=17

I don't know what the above poster was doing.

P

sorry, bit rusty, corrected work.

I get:

x = 13
y = 17

Isolate for x:

x = (9 + y) / 2

Substitute expression for x into other equation and solve first-order equation for y.

reply to post by Manhater


Soz, we posted at the same time. I was referring to post no. 2.

4x = 18+2y simplified for y is
2x-9 = y

-6/5x+y=7/5 simplified for y is
y=7/5+6/5x

Therefore

2x-9 = 7/5 + 6/5x solve for x

x=13

to solve for y

4x=18+2y
4*13=18+2y
y=17

As a check, do it all again solving for y in the first instance

P

reply to post by pheonix358


I did a quick version.

if you want actual values popping out for x and y you will need to specify one parameter first. Thats simple. Its tough whne you need to solve a solution for x and y in multiple system eg

3X + 8 = 4Y + 3
6Z + 7 = 7Y + 4
5X + 3 = 6Z + 1

Then you need to use mathematic matrices. Good luck!

Love you all. Thank you. I passed with an 81%. Sad crud is, those reviews, the scores do NOT figure into your overall. So they don't count at all, yet you STILL need an 80 or higher to move on. I hate it so much.

If I need help with my test, I'll be sure to post here. You all are amazing

Glad to help!

I was doing this stuff 40 years ago. ROFL

P

reply to post by pheonix358


Math is not my subject, nor is it needed for my degree (that i can't pursue after the next 2 classes as loans dried up sadly). Also, we're doing graphs and being online, and being almost 40, my eyes mess up when I try to see the small graphs from the online class. It's horrible xD

Math is not my subject, nor is it needed for my degree (that i can't pursue after the next 2 classes as loans dried up sadly). Also, we're doing graphs and being online, and being almost 40, my eyes mess up when I try to see the small graphs from the online class. It's horrible xD

Math is a left brain function and some people are right brained creative. Mabey its time to explore you creative capabiilities. I suggest go to laura eisnhower cosmi gaia facebook page. You see some really interesting applications of the right brain power going on there.

reply to post by sarra1833


Wanna know how to do this with linear algebra? It's all quite simple once you put thing in terms of 3-space vectors.