Download 3-4: Slope- Intercept Form Warm-up (Solve it only): What is a Y

3-4:
SlopeIntercept Form
Warm-up (Solve A box contains 5 green marbles, 4 blue
marbles and 6 red marbles. A marble is
it only):
picked at random. Without replacing the
first marble, another marble is taken from
the box. Calculate the probability that:
(a) the first marble green and the second
marble red
(b) two marbles are the same color.
What is a Y- The y-intercept of a line is the y-coordinate
of the point where the line crosses the yIntercept?
axis.
y-intercept
x-axis
y-axis
Slope Formula
= m slope formula
; (x1,y1) = (0,b) and (x2,y2) = (x,y)
simplify
y–b=m∙x
Multiplication Property of
Equality
y = mx + b
Slope
y-intercept
What is the
Slope-intercept Nonproportional linear relationships can be
written in the form y = mx + b. This is
Form?
called the slope-intercept form.
Example 1:
State the slope and the y-intercept of the
equations.
A) y = -5x + 3
B) y = x - 6
Example 2:
C) Write an equation in slope-intercept
form for the graph shown.
D) Write an equation of a line in slopeintercept form with a slope of
and a y-
intercept of -3.
Example 3:
A taxi fare y can be determined by the
equation y = .50x + 3.50, where x is the
number of miles traveled.
E) Graph the equation
F) Interpret the slope and the y-intercept.