Question

Solve by graphing.. attachment. I dont understand how to do this, if you could help that would be great thanks.

Answer 1

To solve by graphing we first need to plot both equations. (see attachment).

What would you do next?

Answer 2

then we would see where it intersects, right?

Answer 3

Exactly. Since they only want you to solve by graphing you just have to read it off the graph as close as you can. They don't ask you to actually solve for the exact answer.

Answer 4

it looks to me that is at (0,5)

Answer 5

Looks about right. Somewhere around 4.5 or 5.

Answer 6

okay will try that thanks.. i tried to graph it but would not do it like your graph.

Answer 7

if you want, you can download
geogebra
which will let you graph these equations.

Answer 8

@phi thanks might do that and @twvogels it was 4.5 :) thanks

Answer 9

Or you can go to https://www.wolframalpha.com

Enter the following:

plot 3x+y=4.5 and y=(1/2)*(x-3)^2

It will give you this:

https://www.wolframalpha.com/input/?i=plot+3x%2By%3D4.5+and+y%3D%281%2F2%29*%28x-3%29%5E2

Answer 10

Oh cool thanks :) think i will use that from now on i was using meta-caculator. and all it did was show me a parabola and no intersections

Answer 11

If you change:

plot 3x+y=4.5 and y=(1/2)*(x-3)^2

to

solve 3x+y=4.5 and y=(1/2)*(x-3)^2

it will give you the exact intersection point. But you should really only use it to check after you solve it yourself.

Answer 12

Okay thanks.. so if i had this problem y + 2 = 1/4(x -4)^2 and x - y = 6 i put that in and it should give me a graph

Answer 13

cause i tried and it doesnt show a graph

Answer 14

you would need to enter:

plot y+2=(1/4)*(x-4)^2 and x-y=6

Answer 15

tokay thanks :)