HW (for extended)

Distance for Point – line

1.     Find the distance between (3,4) to the line 2x-5y=-1  

(answer:13root29/29 ) 

2.     Find the distance between (-1,-4) to the line 3x+y=7

 (answer: 7root10/ 5)

3.     Find the formula of the distance between (a,b) to the line Ax+By=C, verify your formula with the answers above.  (answer: it depends on how you prove it and what forms you express)