Melody

Thanks for answering Helpbot,

I am sorry to say that you have not solved it.

You see you have a y on both sides.

You have to have y on one side and en expression with m on the other side.

Think of m just as a constant. I mean treat it like it is a number that stays the same all the time.

\(y^2-my+(2m-1)=0\\ \text{This is a quadatic equation}\\ \text{It is of the form}\\ ay^2+by+c=0\\ \)

NOW  to solve this you use the quadratic formula.

\(y = {-b \pm \sqrt{b^2-4ac} \over 2a} \)

So now you solve yours.

Hint:       a=1    b=-m      c=(2m-1)

Your answer will be will have an m in it.

--------------

AFTER  you have done this, think about how many answers there can be for y. 

How can you make this happen?

ok, no worries   

Yep,

Guest has given you a very good answer Juriemagic.

Thanks Guest.

That is great. 

Give it a go and come back and ask for more help if you need it. 

Don't forget to explain what you have tried though.    

A lead cast in the shape of a cone with a base diameter of 210mm and a perpendicular height of 110mm

is melted and recast in the shape of a sphere....

You need to find the VOLUME of the cone first.    

Can you do that please ?

South Africa has got the best beaches in the world do I am told. No laughing matter at all.   

Anyway, can you provide us with a pic of your question?

2+x+y=7

x+y=5

find all the pairs that will make this work.

Alex thinks 131 degrees are neat. What is the maximum number of interior angles of a convex 190-gon that can have measure 131 degrees?

Angle sum of an  n  sided polygon is 180(n-2)

So the angle sum of 190gon (which i assume means 190 sides ) is

Sum of angles = 180*188 = 33840 degrees

All angles are less than 180 degrees

131x+180y<33480       x+y=190    x is the number of 131 degrees angles and y is the number of other angles.

solve simultaneously.

131x+180y=33480 (1)

    x   +  y   =  190    (2)

Solve simultaneously and round x and y down to the nearest integer

Then check your answer.    

I have not checked what i have said.  You need to do that.

Juriemagic,

These questions are not making sense. 

I am wondering if you are interpreting them incorrectly.

If possible, could you please post a picture of the actual question?   Like maybe a screenshot. Or a photo.

Also, it might help to know what country you are in as symbols can mean different things in different countries.  

Thanks EP,

I'd put those numbers in parenthesis because you are finding sets.

domain is the x values    { 0,  1,  2,   -4 }

range is the y values    { 1,  -3,  -4  }

Maybe it does not matter, that is just the way I learned it.