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

1 answer:

6 0

"Line L has an undefined slope" so line L is any vertical line.

Anything perpendicular to this vertical line will be horizontal. So line M is horizontal.

Horizontal lines are of the form y = k for some fixed number k. The only thing that fits is choice B) y = 7 where k = 7 in this case.

Choice A graphs out a diagonal line, choice C graphs a vertical line, while choice D graphs out a hyperbola. These facts are why we can eliminate these non-answers.

Answer: Choice B) y = 7

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Step-by-step explanation:

In this problem 10 represents 9% of a number. So, to find 90% you must multiply 10 by 10. You do this because 9% times 10 equals 90%; therefore, 100 must be 90%.

This can also be proven through cross multiplication. To set up a proportion put the percent over the number like, $\frac{9}{10}=\frac{90}{x}$ . Then cross multiply to get the equation, $9x=900$ . Finally, divide both sides to get x=100.