Slope-Intercept Formula 1
Feb 08, 2016
Slope-Intercept Formula1
GOAL
• Given a line, write a slope-intercept equation.
Slope-Intercept Form
• We need two things, can you guess what they are?
Slope Y-intercept
Equation!
𝑦=𝑚𝑥+𝑏m = Slope
Remember:
b = y-intercept The place where the line crosses the y-axis. Also, when x=0
Example 1
Identify the slope and y-intercept.
• Slope=2• y-intercept=-10
You try!
• Slope and y-intercept?
Example 2
Find y when x=3.
What do we do? Plug 3 in for x.
So: The point (3,-4) is on the line .
You try!
Find y when x=3
Answer: (3,0)
Example 3
Slope and y-intercept?
Slope = 1 Intercept = 0.
Example 4
• Sometimes you will need to solve for y first to get it in the form y=mx+b.
Slope = -2Intercept = 9
Remember
Is equivalent to
Example 5
• Write an equation of the line.
• Slope=?• y=intercept?
Answer:
You try!
You try again!
Homework