Equation of a straight line

How do you determine if two linear equations are perpendicular?

• The product of the slopes of two linear equations is 1.

• The sum of the slopes of two linear equations is -1.

• The sum of the slopes of two linear equations is 0.

• The product of the slopes of two linear equations is -1.

Given the slopes of two lines, identify whether the lines are parallel, perpendicular or neither.

Slope of line #1 = 8

Slope of line #2 = 1/8

• Parallel

• Perpendicular

• Neither

What slope is parallel to:  
m = 3/4

• 4/3
• 3/4
• -3/4
• -4/3

Given the slopes of two lines, identify whether the lines are parallel, perpendicular or neither.

Slope of line #1 = 8/9

Slope of line #2 = 8/9

• Parallel

• Perpendicular

• Neither

Explain whether or not the triangles shown could lie on the same line.

• Yes, because their slopes both simplify to -6.

• Yes, because their slopes both simplify to 1/6.

• No, because -72/12 is not the same as -144/24

The pair of figures is similar. Find the missing side.

• x = 10
• x = 4
• x = 2
• x = 5

What is the slope of the line that is perpendicular to y = 3/4x + 5/3?

Do not type any spaces

If a line has a slope m=2/9, then what is the slope of the line that is parallel to it?

• m=-9/2

• m=2/9

• m=9/2

A line is perpendicular to    
y = 2x - 7.
What is the slope of that line? 

• -2
• 1/2
• -1/2
• 2

Slopes of perpendicular lines are...

• opposite reciprocals.
• opposites.
• identical.
• always 7.