MaplePrimes - answers and comments on Question, Viewing the intercepts on a graph?

for example

Christopher2222 — Tue, 18 May 2010 18:46:11 Z

plot({3*x+5, 2*x^2-2})

Viewing the intercepts on a graph?

Dogod — Tue, 18 May 2010 18:50:45 Z

Hi, yes thanks, but that's not the problem, the two functions obviously give me intercept

but I wonder if you can display the points in each intersection on the graph.

Thank you very much

use solve

Christopher2222 — Tue, 18 May 2010 19:04:34 Z

solve( { your equation1 , your equation 2 } , { x , y } )

Then use allvalues

RE: Viewing the intercepts on a graph?

Dogod — Tue, 18 May 2010 19:09:32 Z

I do not understand my friend, what I say is to solve the equation to find the points of interception?

But that's not the prolem, I only have a specialized graphics where in the same graph

Maple interception showing points, I do not think you understood me.

You could further expand the explanation using the functions you gave me?

Thank you very much ...

plotted points

Christopher2222 — Tue, 18 May 2010 19:32:36 Z

Okay, so now you have the x and y points of the intersection, and now you want to display those intersection points.

b := allvalues(solve({y = 3*x+5, y = 2*x^2-2}, {x, y}))

b := {x = 3/4+(1/4)*sqrt(65), y = 29/4+3*sqrt(65)*(1/4)}, {x = 3/4-(1/4)*sqrt(65), y = 29/4-3*sqrt(65)*(1/4)}

c := [[rhs(b[1, 1]), rhs(b[1, 2])], [rhs(b[2, 1]), rhs(b[2, 2])]]

c := [[3/4+(1/4)*sqrt(65), 29/4+3*sqrt(65)*(1/4)], [3/4-(1/4)*sqrt(65), 29/4-3*sqrt(65)*(1/4)]]

with(plots):

d:=pointplot(c,symbol=circle, symbolsize=30, color=blue)

f := plot({3*x+5, 2*x^2-2})

display(d,f)

Re: Viewing the intercepts on a graph?

Dogod — Tue, 18 May 2010 19:57:53 Z

Hello .., how nice ... Thanks for the code I see that it is possible to show the value add in points ... Is it possible?

Also wanted to ask you something:

For a graph linear programming work as follows:
with (plots)
inequal ({x +3 * y <= 200, 2 * x +2 * y <= 300, y<=60, y >=0, x >=0}, x = -400 .. 400, y = - 400 .. 400);

Which shows me a whole feasible region.

And this case I want to show the intercept.

It would similarly?

Thank you for your invaluable help.