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in the xy-plane, line L passes through the origin and is perpendicular to the line 4x+y=k, where k is a constant. if the two lines intersect at the point (t,t+1), what is the value of t ?

 Dec 7, 2015

Best Answer 

 #1
avatar+130547 
+10

A line passing through the origin and perpendicular to the line  4x + y = k  will have a slope of (1/4) and the equation of this line will be  y = (1/4)x

 

And at (t, t +1 )  we have that

 

t + 1 =  (1/4)t

 

(3/4) t =  -1

 

t = -4/3    then t + 1  will = -1/3

 

And we can find k as

 

4t +[ t + 1 ]  = k

 

-16/3 - 1/3  = k = -17/3

 

Here's a graph of both lines and the intersection point :.......https://www.desmos.com/calculator/c5qsf7jlo2

 

 

 

cool cool cool

 Dec 7, 2015
 #1
avatar+130547 
+10
Best Answer

A line passing through the origin and perpendicular to the line  4x + y = k  will have a slope of (1/4) and the equation of this line will be  y = (1/4)x

 

And at (t, t +1 )  we have that

 

t + 1 =  (1/4)t

 

(3/4) t =  -1

 

t = -4/3    then t + 1  will = -1/3

 

And we can find k as

 

4t +[ t + 1 ]  = k

 

-16/3 - 1/3  = k = -17/3

 

Here's a graph of both lines and the intersection point :.......https://www.desmos.com/calculator/c5qsf7jlo2

 

 

 

cool cool cool

CPhill Dec 7, 2015
 #2
avatar+2499 
0

i am stupid 

thanks CPhill ! :)

 Dec 8, 2015

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