2-3 Solve It!
You can use
proportions to help
you solve this.
By what value do you multiply height h
tto get height H? Suppose you rotate the
line about the origin so that the line passes
li
tthrough point P. By what value do you multiply
tthe new height h to get the new height H?
P
h
H
A
O
B
2-3 Lesson Quiz
1. What is the slope of the line that passes through (22, 3)
and (4, 25)?
2. What is an equation of the line with slope 4 and y-intercept
at (0, 23)?
3. Write the equation 12 2 y 5 2x 2 5 in slope-intercept
form. What are the slope and y-intercept?
4. What is the graph of 5x 5 2y 2 20?
5. Do you UNDERSTAND? Can a horizontal line have an
x-intercept? What if the line passes through the origin?
Explain.
Answers
Solve It!
A A
;
B B
Lesson Quiz
1. 234
2. y 5 4x 2 3
3. y 5 22x 1 17; m 5 22,
y-intercept (0, 17)
4.
5. Not unless the line is the
x-axis. If the horizontal line is
the x-axis, then every point
on it is an x-intercept.
10
4
8
O
Prentice Hall Algebra 2 • Solve It/Lesson Quiz on Transparencies
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