Aim #1.4: How do we write linear
equations?
 Slope-Intercept Form:
 y = mx + b
 where m is the slope and b is the y-intercept.
 How do you know you have b?
Either you will see b = ??, or you will be given the ordered
pair (0, ??) because the value of x at any y-intercept is 0.
How do you find the slope?
Either it will be given to you (m = ??), or you can
use slope formula: m =
when given two ordered pairs.
Write the linear equation.
a) m = 3, b = -4
b) m = 2/3, b = 7
c) m = 4, (0, -2)
d) Passing through (-3, 6 ) and (0, 2)
Part 2: How do we write linear
equations in point-slope form?
 You can turn any point-slope form into slopeintercept form by solving, to get y by itself!
 Formula is:
where m, , and
are the variables being
replaced with your information.
 You may need to use slope formula to find the slope
value. Then, you may choose either ordered pair
(if given two) to plug into the formula.
Part 2: How do we write linear
equations in point-slope form?
a) m = -3, (3, -1)
b) (-1, 3), (2, 9)
c) (4, -1), (6, -7)
Summary: Answer in complete
sentences.
 What is the slope of a line and how is it found?
 Describe how to write the equation of a line if two
points along the line are given.
Extension:
Use the figure on the right
to answer the following:
 List the slopes in
decreasing order.
 List the y-intercepts in
decreasing order.