Question

write and equation for the line that is perpendicular to the line y=4x+5 and that passes through the point (0,-3)

Answer 1

remember that a line perpendicular would have the slope of the opposite signed reciprocal of this line. and you would plug your point in to point slope form with your slope to get the equation
y-y=m(x-x) point slope

Answer 2

Thank you! (:

Answer 3

your welcome

Answer 4

WAAAAIIT. LOL im confused cause i only have 1 point and not two..

Answer 5

think of your other point as a variable in the equation y=mx+b where m is the slope and b is the y intercept.

Answer 6

put your point and slope into point slope form and solve for y

Answer 7

so i just put some random number into the equation?

Answer 8

no you have a point to plug in. (0,-3) and m=-1/4
so you have enough to be left with 2 variables

Answer 9

so its -3=-1/4(0)+5?

Answer 10

no
\[y+3=-1/4(x-0)\]

Answer 11

your old y intercept isn't related to this

Answer 12

ohhhh okay

Answer 13

sorry my algebra teacher didn't teach us this yet =______= an just assigned us the work

Answer 14

and what do i do with the my old y-intercept?

Answer 15

its irrelevant to the new lines equation. graph your first line. then graph your second line and you will see what im talking about the new line will have its own y intercept

Answer 16

what did you get. there is only 2 steps to this problem once in point slope

Answer 17

i got y=-1/4x-3

Answer 18

perfect did you graph them. even if it doesn't ask you to graphing them will help your intuitive thinking.

Answer 19

yeah '

Answer 20

Thank you! (: haha i appreciate it.