EDGE Math 8

1.	Let A and C be real numbers such that $A \neq 0,$ and let S be the relation $S = {(x, y) \| A x + C = 0} .$ What is the range of the relation S?

{- \frac{C}{A}}

{\frac{C}{A}}

an empty set

the set of real numbers

Answer: the set of real numbers

2.	What is the slope of the line that passes through the points $(6, - 10)$ and $(8, - 18) ?$

- \frac{1}{4}

\frac{1}{4}

−4

4

Answer: −4

3.	Which of the following describes a line with a negative slope?

a vertical line

a horizontal line

a line that falls from left to right

a line that rises from left to right

Answer: a line that falls from left to right

4.	Which of the following statements is false?

Horizontal lines have a slope of 0.

Vertical lines have undefined slopes.

Nonvertical parallel lines have the same slope.

Perpendicular lines, none of which is vertical, have slopes that are reciprocals of each other.

Answer: Perpendicular lines, none of which is vertical, have slopes that are reciprocals of each other.

5.	What is the equation of the y-axis?

x = 0

y = 0

y = x

undefined

Answer: x = 0