Upcoming SlideShare
×

Like this presentation? Why not share!

# Module 4 topic 3 2nd

## on Oct 02, 2011

• 464 views

Even more writing linear functions

Even more writing linear functions

### Views

Total Views
464
Views on SlideShare
464
Embed Views
0

Likes
0
0
0

No embeds

### Report content

• Comment goes here.
Are you sure you want to

## Module 4 topic 3 2ndPresentation Transcript

• Module 4 Topic 3
More – Writing Equations of Linear Functions
• Example 1
Slope = m
The formula to find slope is;
(y2 - y1) ÷ (x2 - x1)
• Example 2
What is the slope of a vertical line?
Vertical lines have no slope so they are undefined.
• Example 3
What is the slope of a horizontal line? Horizontal lines have a slope of zero!
• Example 4
Similar Problem: Find the slope of the line that passes through (-3, 6) and (-4, 4).
m = (4 - 6) ÷ (-4 - -3)
m = -2 ÷ -1
m = 2
• Example 5
Point-Slope form is y2 - y1 = m(x2 - x1)
• Example 6
Similar Problem: Write the equation of the line in point-slope form that has a slope of -4/5 and passes through the point (3, 11).
y2 - y1 = m(x2 - x1)
y - 11 = -4/5 (x - 3)
• Example 7
Similar Problem: Write the equation of the line in slope-intercept form that has a slope of -4 and passes through the point (2, 0).
y = mx + b
0 = -4(2) + b
0 = -8 + b
8 = b
y = -4x + 8
• Example 8
What is the equation for Standard Form?
Ax + By = C
• Example 9
Similar Problem: Change the linear equation y - 8 = 4(x - 3) to Standard Form.
y- 8 = 4(x - 3)
Solve for y.
Distribute 4.
y- 8 = 4x – 12