The ratio x:y=2:3 . Use this information to write another equation connecting x and y

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lailaoeak

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HI all,

I am really struggling with this one here.

Untitled.jpgI hope you can see the picture clearly. These are two parallel lines.

First I need to use a diagram to write an equation connecting x and y.

So,

I know that x and y together will equal 180*, as they are on the straight line.

x+y=180*



Secondly,

the ratio x:y=2:3

use this information to write another equation connecting x and y.


what do I do??

I have no idea how to write the exuation: it surely, cannot be 2x+3y=180* , because x and y shoul not have the same values?

Please help! I don't even know where in the textbook should I look for help? What topic does cover these kind of questions?
 
not sure. Why is it correct? Should I write something like that to make it clear for an egzaminer:

y=3x , 2x + 3x=180* ?
 
lailaoeak said:
HI all,

I am really struggling with this one here.

View attachment 5175I hope you can see the picture clearly. These are two parallel lines.

First I need to use a diagram to write an equation connecting x and y.

So,

I know that x and y together will equal 180*, as they are on the straight line.

x+y=180*



Secondly,

the ratio x:y=2:3

use this information to write another equation connecting x and y.


what do I do??

I have no idea how to write the exuation: it surely, cannot be 2x+3y=180* , because x and y shoul not have the same values?

Please help! I don't even know where in the textbook should I look for help? What topic does cover these kind of questions?
Click to expand...

x/y = 2/3..... second equation or →

2y = 3x ..... second equation or →

2y - 3x = 0 ..... second equation

Take your pick ....
 
lailaoeak said:
Now I am really confused! Why?

if x:y=2:3 isn't it 180*/5= 36* so, 2x36*=72 and 3x36*=108* ??
Click to expand...
STOP! Start over again

You know
x + y = 180.
Use one of Subhotosh Khan's expressions or equivalent, for example
3x - 2y = 0.

Now solve for x and y.
 
lailaoeak said:
Now I am really confused! Why?

if x:y=2:3 isn't it 180*/5= 36* so, 2x36*=72 and 3x36*=108* ??
Click to expand...
What you did is all correct. The one thing you left out is answering the question!! What are the values of x and y??!!
y=2*36=72 and x=3*36=108
 
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