EDGE Math 8

1.	How would you describe the graph of the equation $x = 9$ on the coordinate plane?

a vertical line that passes through

(9, 0)

a horizontal line that passes through

(9, 0)

a vertical line that passes through

(0, 9)

a horizontal line that passes through

(0, 9)

Answer: a vertical line that passes through $(9, 0)$

2.	How would you describe the graph of the equation $y = - 3$ on the coordinate plane?

a vertical line that passes through

(0, - 3)

a horizontal line that passes through

(0, - 3)

a vertical line that passes through

(- 3, 0)

a horizontal line that passes through

(- 3, 0)

Answer: a horizontal line that passes through $(0, - 3)$

3.	What is the slope of the line with equation $y = - x + 8 ?$

1

−1

8

−8

Answer: −1

4.	What is the y-intercept of the line with equation $y = - x + 8 ?$

1

−1

8

−8

Answer: 8

5.	What are the intercepts of the line with equation $\frac{x}{5} + \frac{y}{- 2} = 1 ?$

5 and −2

−5 and 2

\frac{1}{5}

and

\frac{1}{- 2}

none of the choices

Answer: 5 and −2

6.	If the slope of line l is –3, what is the slope of a line that is parallel to l?

–3

3

- \frac{1}{3}

\frac{1}{3}

Answer: –3

7.	If the slope of line l is –3, what is the slope of a line that is perpendicular to l?

–3

3

- \frac{1}{3}

\frac{1}{3}

Answer: – $\frac{1}{3}$