//// flow 



rhenc< . itiiiK the coordinate* of A a 



' A)* = 4 

 i for tin* 



hii-li is 



o |>unil>olu. 





of 



EXERCISES 



Construct the following parabolas, and find their equations: 

 1 ng the focus at the point < 1, :i), .u,.l tor directrix the line 



3.r-.Vv 



2. having the focus at the origin, and f>t the line 



2x-y + 3 = 0; 



3. with the vertex at the origin, and the focus at the poi: 



4. with the vertex at the origin, and the focus at ti..- ]-.i- 



5. with the vertex at tl..- j-.i- and the fociix at the ; 



6. with the vertex at the point . .md tl,,- f.<u at the 



T. having the focus at the point (J/..u>. and f..r dn.-trix the line 

 =-- >. 



8 \Y hat is the latun n-.-t um of ,. ;l ,-h ,,f the parabolas of exercises 3 to . 

 the effect produced on the form of a parabola by 

 he length of iU latit-* rectmn. 



107 Every equation of the form Aft 2 fJjr - 2 JV C = O t 



/ -' -// <' o, represents a parabola whose 

 axis is parallel to one of the coordinate ares. 



Qfl [ U ]. [ \'2]. .in.l [ I: 1 . | an* of tin- fnnn 

 By* 4. i> G, + -' />/ 4- (7= 0, or Ai* 4- *2 f/r + 2 f> + C- ; 



