Download 4.6 Quick Graphs Using Slope

October 21, 2014
4.6 Quick Graphs Using Slope-Intercept Form
Objectives: Use Slope-Intercept Form to graph equations.
m
Slope - Intercept Form
y = mx + b
b
Ex: y = 5x - 2
m=
b=
y-intercept
Slope
10
Hi!
y-int.
Math Guy
Ex: Write the equation in slope-int. form and identify the slope
and y-int.
Slope-Intercept Form
(y = mx + b)
1)
y = 5 - 2x
2) y = x - 2
3
3) y = 13
4) 2.2x - 4.4y = 0
5) 3x + 4y = 8
Slope
(m)
y-intercept
(b)
October 21, 2014
We can use Slope-Int. form to graph!
Steps for graphing:
1. Put equation in slope-int form.
2. Identify the slope (m) and y-intercept (b).
3. Plot the y-int.
4. Starting at the y-intercept, count the slope.
Ex: Graph -2x + y = 5
Now, graph y = 2x - 1.
What do you notice?
Parallel
Parallel lines
lines have
have equal
equal slopes.
slopes.