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# C2 Logs Maths OCR watch

1. Y=2*3^x
When X = 0 Y= 2

When Y = 0 0 = 2*3^x
I cannot solve the Y part, can somebody help me please?

Thank you
2. (Original post by Jusst Haris)
Y=2*3^x
When X = 0 Y= 2

When Y = 0 0 = 2*3^x
I cannot solve the Y part, can somebody help me please?

Thank you
That equation is invalid, since for all .

There is no value of that will satisfy that equation, in other words.

Is that the actual question though? Can I see what the actual question is?
3. (Original post by kingaaran)
That equation is invalid, since for all .

There is no value of that will satisfy that equation, in other words.

Is that the actual question though? Can I see what the actual question is?
Sketch the curve y = 2 * 3^x, stating the co-ordinates of any intersections with the axis.

One of the intersections is at (0,2) i assumed that there should be another one how do i work that out?
4. (Original post by Jusst Haris)
Sketch the curve y = 2 * 3^x, stating the co-ordinates of any intersections with the axis.

One of the intersections is at (0,2) i assumed that there should be another one how do i work that out?
Ah!

Okay, so you tried to work out where it crossed the axis.

And when you did that you ended up with , which cannot be solved.

Now the fact this equation has no solutions, what does it tell you about the curve? Does it cross the axis?

Hint
Consider graphs such as , which, if you try to do a similar thing, end up with the same problem
5. (Original post by kingaaran)
Ah!

Okay, so you tried to work out where it crossed the axis.

And when you did that you ended up with , which cannot be solved.

Now the fact this equation has no solutions, what does it tell you about the curve? Does it cross the axis?

Hint
Consider graphs such as , which, if you try to do a similar thing, end up with the same problem
Oh Okay i understand thank you, it's an asymptote, it gets closer to x - axis but never touches.
Does this mean the only co-ordinate i can label is (0,2)?
6. (Original post by Jusst Haris)
Oh Okay i understand thank you, it's an asymptote, it gets closer to x - axis but never touches.
Does this mean the only co-ordinate i can label is (0,2)?
Indeed

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