Question

Write and equation of the line that passes through the given point and is perpendicular to the graph of the given equation:

(5,7); y= 1/3x + 2

Answer 1

Okay. Do you have any idea where to start?

Answer 2

Hint : if you have two straight lines and they are perpendicular
Then M1 x M2 =-1
when M = Slope .

Answer 3

Here's the hint: The slope of a line perpendicular to another is the negative reciprocal. If the slope is m, then the slope of the perpendicular line is -1/m. Does that make sense?

Answer 4

@inkyvoyd It sort of does... I understand that part but I don't get what comes next

Answer 5

Well, you are given a line. You want to know the slope of a line perpendicular to it. With the line you are given, what is the slope? Whatever the slope is, the slope of a line perpendicular to it is -1/m where m is the slope.

Answer 6

@inkyvoyd The slope is already given so I did the reciprocol. So instead of the basic problem of (5,7); y= 1/3x + 2 ... So far I have 3x (+ or - somthing) I need to figure out the something

Answer 7

Wee, you need to be careful to take the negative. You have a slope m=-3. and you have to condition that (7)=(-3)(5)+b

(I just substituted y, m, and x into y=mx+b, the equation of the slope-intercept line)

Answer 8

@inkyvoyd SO my final answer would be y= -3x + 9 ?

Answer 9

No.
How did you get that answer?

Answer 10

@inkyvoyd Ack I knew it I'm a dumbarse

I got it because -3 is the slope and using y= mx+b
And -3 times 3 (5 -2) is -9

Answer 11

uhh, I'll work it out step by step
y=mx+b m=-3 (x,y)=(5,7)
(7)=-3(5)+b
7+15=b
b=22

Answer 12

@inkyvoyd Thanks, hopefully I can continue my homework correctly aha (:

Answer 13

okay - tell me your final answer :)

Answer 14

@inkyvoyd y= -3x +22 ?? *prays that shes right*