In your math notebook find the value of x so that the lines are parallel.

Find and use slopes on lines:

Find and use slopes on lines:

• The slope of a nonvertical line is the ratio of vertical change (rise) to horizontal change (run) between any two points on the line.

Find and use slopes on lines:

• The slope of a nonvertical line is the ratio of vertical change (rise) to horizontal change (run) between any two points on the line.

Find and use slopes on lines:

• Negative slope:

Find and use slopes on lines:

• Negative slope:• Falls from the left to right.

Find and use slopes on lines:

• Negative slope:• Falls from the left to right.

Find and use slopes on lines:

• Positive slope:

Find and use slopes on lines:

• Positive slope:• Rises from left to right.

Find and use slopes on lines:

• Positive slope:• Rises from left to right.

Find and use slopes on lines:

• Zero slope (slope of 0):

Find and use slopes on lines:

• Zero slope (slope of 0):• Horizontal line.

Find and use slopes on lines:

• Zero slope (slope of 0):• Horizontal line.

Find and use slopes on lines:

• Undefined slope:

Find and use slopes on lines:

• Undefined slope:• Vertical line.

Find and use slopes on lines:

• Undefined slope:• Vertical line.

Find and use slopes on lines:Find the slope of any line by using two points and the equation for M.

Find and use slopes on lines:

Find the slope of A

Find the slope of B

Find the slope of C

Find and use slopes on lines:

Find the slope of A

Find the slope of B

What do you notice aboutthe slopes of A and B?

Find and use slopes on lines:

Find the slope of A

Find the slope of B

What do you notice aboutthe slopes of A and B?

Parallel lines have the same slope.

Find and use slopes on lines:

Find the slope of A

Find the slope of B

What do you notice aboutthe slopes of A and B?

Find and use slopes on lines:

Find the slope of A

Find the slope of B

What do you notice aboutthe slopes of A and B?

Perpendicular lines have negative inverse slopes.

Find and use slopes on lines:

Find the slope of A

Find the slope of B

What do you notice aboutthe slopes of A and B?

Perpendicular lines have negative inverse slopes.Negative inverse means opposite signs and flipped.

Find and use slopes on lines:

What kind of slope does each line have?A =

B=

C=

D=

Find and use slopes on lines:

• Tell whether the liens through the given points are parallel, perpendicular, or neither.

• Line 1: (1,0), (7,4)• Line 2: (7,0), (3,6)

• Line 1: (-3,1), (-7,-2)• Line 2: (2,-1), (8,4)