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#1 2014-08-25 16:21:03

math4matthew
Member
Registered: 2014-08-25
Posts: 3

intersecting lines...

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

a) -4/3

b) -5/4

c) 3/4

d) 5/4

e) 4/3

How do you figure this out?

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#2 2014-08-25 18:25:10

Olinguito
Member
Registered: 2014-08-12
Posts: 649

Re: intersecting lines...

The line
is perpendicular to
and so has gradient
; since it passes through the origin, its equation is

[list=*]
[*]

[/*]
[/list]

The point
lies on it. Substitute in these co-ordinates and find the value of
.


Bassaricyon neblina

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