How do I solve?

y

Question

How do I solve?

y<= –x + 7
y < 3x + 11

anonymous · Answer

More correctly speaking, how do i set it up to solve?

anonymous · Answer

Hm, heard about linear programming ?

anonymous · Answer

This is completely new to me

anonymous · Answer

The graphical solution is trivial and probably  the intended one, just bring them to slope intercept form and plot the lines .. shade the respective region and try to identify the intersection.

anonymous · Answer

i can bring the second equation to y=mx+b how how do i do it for the first one?

anonymous · Answer

y=mx+b is not the slope intercept form x/a+y/b=1 is, also basic rules of inequality applies when you are modifying.

anonymous · Answer

I am so lost... my text book doesnt like to clarify things... it told me that slope intercept was y=mx+b...

anonymous · Answer

Oops my fault, x/a+y/b=1 is only the intercept form.

anonymous · Answer

ok...  what would be a in this problem. 

i am really sorry to bother you, my textbook is all i have for reference and it told us to work it out and if we couldnt figure it out ask the teacher.. the teacher doesnt know...

anonymous · Answer

a is the x intercept and b is the y intercept.

anonymous · Answer

what would be the first step?  3x/a+y/b=1?

anonymous · Answer

$ y < 3x + 11\Rightarrow \frac y{11} + \frac x {\frac {11} 3} \lt 1 $

anonymous · Answer

Try to do the other one yourself.

anonymous · Answer

y/7+x/11/3<=1?

anonymous · Answer

Yes. now plot them :)

anonymous · Answer

sorry x/7/3

anonymous · Answer

$ y \le  –x + 7 \Rightarrow \frac y7 + \frac x7 \le 1 $

anonymous · Answer

wow... i guess this shows that i am getting tired... thanks... so the two equations are:

$$y/7 +x/7\le1$$
$$y/11+x/11/3<1$$

So I find the LCM and solve?

anonymous · Answer

Dude, don't you know anything about graphing inequalities ?

anonymous · Answer

No.  This is the first I am hearing... Thanks to my school they should change their motto to we wont teach you so dont bother... but I want to learn...

anonymous · Answer

How old is you ?

anonymous · Answer

This should help : http://www.purplemath.com/modules/ineqgrph.htm

anonymous · Answer

I am 14.

anonymous · Answer

Great, so much time to learn mathematics! :)

anonymous · Answer

Yes, but no one at my school wants to teach.

anonymous · Answer

I know, you will find this interesting http://www.maa.org/devlin/LockhartsLament.pdf

anonymous · Answer

what is it?

anonymous · Answer

Some English words joined together to form meaningful sentences .. ;)

anonymous · Answer

It's will explain you why teacher don't teach you and why some people hate maths.

anonymous · Answer

ok...

anonymous · Answer

where do i know to put the slope line?