Could you please, please, help me to graph these inequalities.

jhonwashington · #1 $Old$ November 15th, 2009, 01:29 PM

Hello. How are you guys doing?

I don't have idea about how to graph in excel or word.. could you please help me to graph these inequalities?

1) 3x+4y>4 and x-2y<-1

2) x/2+y/4<1

3) 4x+1y ≥. 26 and 2x+y ≥18
4)x+5y≥ and x+y ≥ 5

thank you.

pickslides · #2 $Old$ November 15th, 2009, 01:38 PM

Quote:

Originally Posted by jhonwashington $View Post$

I don't have idea about how to graph in excel or word.. could you please help me to graph these inequalities?

I did not know word had a graphing package? I think you mean graph in excel and paste such charts into Word.

Quote:

Originally Posted by jhonwashington $View Post$

4)x+5y≥ and x+y ≥ 5

thank you.

This makes no sense.

Quote:

Originally Posted by jhonwashington $View Post$

1) 3x+4y>4 and x-2y<-1

2) x/2+y/4<1

3) 4x+1y ≥. 26 and 2x+y ≥18
4)x+5y≥ and x+y ≥ 5

thank you.

Most of these are in intercept form. All you need to do is find the x-intercept by making y = 0 and then find the y-intercept by making x = 0.

Here's an example.

Quote:

Originally Posted by jhonwashington $View Post$

1) 3x+4y>4

x=0:

$3\times 0 +4y>4$

$0 +4y>4$

$4y>4$

$y>1$

This means you have a point (0,1)

y=0:

$3x+4\times 0>4$

$3x+ 0>4$

$3x>4$

$x>\frac{4}{3}$

This means you have a point $\left(\frac{4}{3},0\right)$

Now join the points and find the required region.

jhonwashington · #3 $Old$ November 15th, 2009, 02:11 PM

Thank you pickslides... could you please help me to graph those inequalities in excel??? I already solved the inequalities, but I don't know how to graph them, for instance, this is how I solved the following inequality:

4x+1y ≥26
2x+y ≥8
X+1/4y=6.5
X+1/2y=9
-1/4y=-2.5
Y=10
X=9-5=4

And you were right about inequality number 4, i forgot to type a number..
3) x+5y≥ 9 and x+y ≥ 5