3.2B Graphs of Equations
March 30, 2011
MATH 1010 ~ Intermediate Algebra
Chapter 3: GRAPHS AND FUNCTIONS
Section 3.2: Graphs of Equations
Objectives:
✬ Sketch graphs of equations using the point-plotting method.
✬ Find and use x- and y- intercepts to sketch graphs.
✬ Write an equation for an application and sketch the graph.
x+2y = 4
x - intercept
y - intercept
plot points
3.2B Graphs of Equations
Graphing an equation:
y = 3x + 2
March 30, 2011
3.2B Graphs of Equations
March 30, 2011
① EXAMPLE
Find the x-intercept, the y-intercept and one other point,
then sketch the graph.
a) y = 4 - 3x
b) y = |x + 5|
3.2B Graphs of Equations
March 30, 2011
c) y = 3 - x2
d) y = x(x-2)
3.2B Graphs of Equations
② EXAMPLE
Write an equation and draw the graph of it.
Zeno has $15.00 and earns $8.00 each week. How
much will he have at the end of x weeks?
March 30, 2011