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The circle C has equation (x3)^2+(y4)^2=25.
i. State the radius and the coordinates of the centre of C.
ii. Find the equation of the tangent at the point (6,8) on C.
iii. Calculate the coordinates of the points of intersection of C with the straight line y=2x+3.
 one year ago
 one year ago
The circle C has equation (x3)^2+(y4)^2=25. i. State the radius and the coordinates of the centre of C. ii. Find the equation of the tangent at the point (6,8) on C. iii. Calculate the coordinates of the points of intersection of C with the straight line y=2x+3.
 one year ago
 one year ago

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experimentXBest ResponseYou've already chosen the best response.1
where do you have problem??
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
let y=mx+c be equation of your tangent dw:1336583832242:dw
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
find the value of m2 put the all the values m2, (6,8) in y = mx + c ... and find the value of c. then you have tangent!!
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
ok what about part 3
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
\[ (x  3)^2 + ((2x+3)  4)^2 = 25 \] Find the value of x, and put the value of x in equation of circle ... and find corresponding y
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
ok im still on part 2 when it comes to graph and stuff i just cant get it thanks though
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
you know how to find slope ... ?? from two points??
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
is that the same thing as the gradient
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
yes ... \[ m = \frac{y_2  y_1}{x_2  x_1}\]
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
allright you know when two lines are perpendicular, if m1 and m2 be their gradient or slope then \( m_1 * m_2 = 1\) ??
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
no i didnt know that so what are the values i should include for this part
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
m1 is just you calculated ... slope(gradient) of that radius!! m2 .. you have to calculate!! using the relation above.
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
http://www.khanacademy.org/math/algebra/linearequationsandinequalitie/v/perpendicularlines?playlist=Algebra+I+Worked+Examples http://www.mathopenref.com/coordperpendicular.html I am not sure if it will help!!
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
No .. you should get m1*m2 = 1 (m1 = 4/3) m2 = 3/4
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
how do i get C which is the y intercept?
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
you know one point ... so it satisfies that equation m = 3/4 (x,y) = (6,8) y = mx+c, c=??
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
Oo .. put the values of x=6 and y=8 since (x,y) is solution and we already know this!!
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
ok i understand now
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
im gonna try part c
 one year ago

GoldRush18Best ResponseYou've already chosen the best response.0
and im stuck once more
 one year ago

experimentXBest ResponseYou've already chosen the best response.1
put y = 2x+3 on (x3)^2+(y4)^2=25 and find the value of x
 one year ago
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