Line L has an undefined slope. Line M is...

Line L has an undefined slope. Line M is perpendicular to line L. Which of the following could be the equation of line M?

A

`x=y`

B

`y=7`

C

`x=-3`

D

`xy=4`

Text Solution

Verified by Experts

The correct Answer is:

B

Difficult: Medium
Category: Heart of Algebra/ Linear Equations
Strategic Advice: A line with an undefined slope is a vertical line, or in other words, parallel to the y-axis. Getting A line that is perpendicular to a vertical line must be a horizontal line, which has a slope of 0. Its equations, therefore, will be of the form `y=0x+b`, or just y=b, where b is a constant. The only equations that meets this criterion is choice (B).

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