Question

please help me understand this one

Answer 1

i need alot of help

Answer 2

@563blackghost

Answer 3

@Directrix here please - thank you

Answer 4

i have said not u=x and v=y for easy understanding

Answer 5

not mean sign

Answer 6

so than you get for first equation y=x

for second after factoriz out on both sides 3 and divide both sides by 3

y=3x+12

yes ?

Answer 7

yes thats true but the graph has to be right or no points

Answer 8

Let u = y
Let v = x

y = x
9x = 3y - 54 or y = 3x + 18

Answer 9

ok i have said invers

Answer 10

u=x
v=y

Answer 11

but i think this is indifferent

Answer 12

>yes thats true but the graph has to be right or no points

I totally understand that.

Answer 13

bc the result need being the same in every two cases

Answer 14

so in case of y=x you get a line what intersect the origin and for x=1 y=1

Answer 15

and for second equation you get for x=-4 y=0

Answer 16

@Directrix can i enter these equations you told me into desmos to get a better graph

Answer 17

Yes, you can.

But, Demos will not accept u and v as variables, I think.

That is why we were converting to x and y as stand-ins for u and v.

Let's move to Desmos and see if it will accept the equations as they are.

If not, we'll go with the x and y variable equivalents.

Answer 18

This is how your graph should look. The intersection point of the two lines is (9,9)

Answer 19

To plot the lines on your graph, do this:

Place a dot on (0,0) and another dot on (-9,-9)
Draw the line connecting them.
That is the line u = v


Then,

Place a dot on (0,18) and another dot on (-9,-9).
Draw the line connecting them.
That is the line 9u = 3v - 54

That should be all you need for this problem's answer.