10
QuizMultiple Choice

Slope-Intercept Form

Question 10 • WI-Mathematics Grade 8 A

The slope of a line is 2. The y-intercept of the line is –6. Which statements accurately describe how to graph the function?

Answer
A
Locate the ordered pair (0, –6). From that point on the graph, move up 2, right 1 to locate the next ordered pair on the line. Draw a line through the two points.
B
Locate the ordered pair (0, –6). From that point on the graph, move up 2, left 1 to locate the next ordered pair on the line. Draw a line through the two points.
C
Locate the ordered pair (–6, 0). From that point on the graph, move up 2, right 1 to locate the next ordered pair on the line. Draw a line through the two points.
D
Locate the ordered pair (–6, 0). From that point on the graph, move up 2, left 1 to locate the next ordered pair on the line. Draw a line through the two points.

Explanation

The y-intercept is –6, so the line crosses the y-axis at (0, –6). A slope of 2 means rise 2 for every run of 1, so from that point move up 2 and right 1 to find another point on the line. Therefore, the correct description is choice A.

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