math1001 sample quiz answer (1 Viewer)

[fush]

can someone explain the how to get that answer in question 5, i dont get why it is a parabola...

after substituting the values (2, 9) into the f(x,y) you get e^0, hence 1.

what do u do then?

im guessing he did x^2 - y + 5 = 0, which is the parabola drawn, but why did he make f(x,y) = 0 ??

http://www.maths.usyd.edu.au/u/UG/JM/MATH1001/r/quiz1_sampsol_2005.pdf

 

[fush]

never mind, worked it out

f(2,9) = e^0 = 1

so e^(x^2 - y + 5) = 1
x^2 - y + 5 = ln(1)
x^2 - y + 5 = 0

hence the parabola