PARCC Graph 3

Question 1

Two lines are parallel. What must be true about their slopes?

Accepted Answer

They are equal

Answer

Parallel lines never intersect because they share the same slope.

Question 2

A line has slope 3. What is the slope of a line perpendicular to it?

Accepted Answer

-1/3

Answer

Perpendicular slopes are negative reciprocals, so the slope is -1/3.

Question 3

In the equation y = -2x + 6, what does the 6 represent on the graph?

Accepted Answer

The y-intercept

Answer

In y = mx + b, the constant b is the y-intercept, here 6.

Question 4

Which point lies on the line y = x - 4?

Accepted Answer

(6, 2)

Answer

Substituting x = 6 gives y = 6 - 4 = 2, so (6, 2) is on the line.

Question 5

A graph shows a line falling from left to right. What is true about its slope?

Accepted Answer

It is negative

Answer

A line that decreases from left to right has a negative slope.

PARCC Practice Test