186k views
2 votes
Which equation represents a line which is perpendicular to the line y=-4x-5?

A. x+4y=-32
B.4x+y=3
C.4x−y=−4
D.4y−x=4

1 Answer

7 votes

Answer:

D.4y−x=4

Explanation:

Perpendicual lines have a slope that is the negative inverse of the referenced line. The reference here is:

y = -4x-5

The slope is -4

The negative inverse of -4 would be +(1/4). Any line that has a slope of +(1/4) will be perpendicular to y=-4x+5.

The equations in the answer options are not arranged according to the standard format of y=mx+b, where m is the slope and b the y-intercept.

We could graph all the equations and look for the one(s) that are perpendicualr, but it might be safer, and faster, to rearrange them in the standard format, and then note the slope:

Slope =+(1/4)?

A. x+4y=-32

4y= -x-32

y = -(1/4)x-8 -(1/4) NO

B.4x+y=3

y = -4x + 3 -4 NO

C.4x−y=−4

y = 4x + 4 4 NO

D.4y−x=4

4y=x+4 +(1/4) <==YES

y=(1/4)x+1 [Option D has a slope of +(1/4). It will be perpendicular]

See the attached graph.

Which equation represents a line which is perpendicular to the line y=-4x-5? A. x-example-1
User Sri Reddy
by
6.4k points