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Writing Linear Equations
Slope Intercept Form!
Warm Up
• 7. A local gym offers memberships for
$265/year. You can take various classes for an
additional $5/class.
• a. Write an equation showing total cost C,
dependent on the number of extra classes, x,
that you take
Slope Intercept
y  mx  b
Slope
Finding Slope
Y= -3/2 x + 2
Your Turn!
Y= 3/4 x + 7
X
Y
0
8
1
4
2
0
3
-4
4
-8
Write a equation for each graph in slope intercept form
Graph each equation
Graph the equation
Find the slope and y intercept of each
line
Y=-8/3 x-3
Y= x + 2
Y=-4/5 x-2
Y=4/3 x -3
y=mx+b
Finding “b”
1. Write the equation of the line that
passes through the points (1, 4) with
a slope of 8
2. Write the equation of the line that has
a slope of 6/5 and passes through the
points (10, 5)
Your Turn!
1. Write the equation of the line that has a
slope of 6/5 and passes through the points
(20, -10)
2. Write the equation of the line that
passes through the points (15, 3) and
has a slope of -2
Putting it all together!
Tyrone is riding on a train at a constant speed. He starts his timer at some point
after leaving the train station. If the train is moving 4 miles per minute and after
4 minuets passes on his timer the train is 19 miles away. How far away was
Tyrone from the train station when he started his timer?
a. Identify the variables (what is the dependent? what is the
independent?)
b. Identify the two coordinates on the graph of this scenario.
c. Write an equation in slope-intercept form representing the
situation.
d. Using your equation, how far will the car be after 6 min?