Ana.stasia
Junior Member
- Joined
- Sep 28, 2020
- Messages
- 118
You have started correctly.Determine the parameter k so that the circle x2 + y2- (k-4) x - ky + 2k +5 = 0 touches the y axis.
So I thought since the circle touches the y axis I could use a point A (0,y), however, I didn't make any process from that.
View attachment 25698
You have started correctly.
You are trying to satisfy one condition - where the circle passes through 'y'. But the circle is touching the y-axis, NOT intersecting the y-axis.
What would be the condition for that?
To be TANGENT - how many values of 'y' should you get?Determine the parameter k so that the circle x2 + y2- (k-4) x - ky + 2k +5 = 0 touches the y axis.
So I thought since the circle touches the y axis I could use a point A (0,y), however, I didn't make any process from that.
View attachment 25698
I really dont know that. My guess is two.To be TANGENT - how many values of 'y' should you get?
INCORRECTI really dont know that. My guess is two.
OneINCORRECT
The tangent touches the circle at how many points?
[Determine the parameter k so that the circle x2 + y2- (k-4) x - ky + 2k +5 = 0 touches the y axis.
because if x = 0, all the non-zero terms form a quadratic in y ... ?@skeeter What right did you have to put the whole constant (2k+5) with the y terms. I'm not saying that you are wrong but rather wondering why you are correct.