1. Geometry Drill 12/1/14
PUT HW ON THE CORNER OF YOUR DESK!
Find the value of m.
1. 2.
3. 4.
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2. Warm Up
Substitute the given values of m, x, and y into
the equation y = mx + b and solve for b.
1. m = 2, x = 3, and y = 0
b = –6
2. m = –1, x = 5, and y = –4
Solve each equation for y.
3. y – 6x = 9
b = 1
4. 4x – 2y = 8
y = 6x + 9
y = 2x – 4

3. Objectives
Graph lines and write their equations in
slope-intercept and point-slope form.
Classify lines as parallel, intersecting, or
coinciding.

4. Vocabulary
point-slope form
slope-intercept form

7. Remember!
A line with y-intercept b contains the point (0, b).
A line with x-intercept a contains the point (a, 0).

8. One interpretation of slope is a rate of change.
If y represents miles traveled and x represents
time in hours, the slope gives the rate of
change in miles per hour.

10. Caution!
Four given points do not always
determine two lines.
Graph the lines to make sure the points are
not collinear.

11. Assignment
• Hand out Practice 3-5 and 3-6
• CHAPTER TEST FRIDAY!

12. Lesson Review
1. Use the slope formula to determine the slope of the line that passes through M(3, 7) and
N(–3, 1).
m = 1
Graph each pair of lines. Use slopes to determine whether they are parallel,
perpendicular, or neither.
2. AB and XY for A(–2, 5),
B(–3, 1), X(0, –2), and Y(1, 2)
4, 4; parallel
3. MN and ST for M(0, –2),
N(4, –4), S(4, 1), and T(1, –5)

13. Lesson Review
Write the equation of each line in the given
form. Then graph each line.
3. the line through (-1, 3)
and (3, -5) in slope-intercept
form.
y = –2x + 1
4. the line through (5, –1)
with slope in point-slope
form.
2
5
y + 1 = (x – 5)

14. Lesson Review
Determine whether the lines are parallel,
intersect, or coincide.
5. y – 3 = – x,
intersect
1
2 y – 5 = 2(x + 3)
6. 2y = 4x + 12, 4x – 2y = 8
parallel