When you see "(100, -50)" it is an ordered pair with two components; the
first component is 100 which indicates the distance to the right of the origin
(to the left if it is negative), and the second component is -50 which
indicates the distance down from the origin (up if it is positive). This movement
to the left or right and up or down locates a unique point; see Figure 15.13.
There are many problems throughout the text labeled IN YOUR OWN WORDS. Just relax; do not be afraid
to give your opinion. Here are some hints:
Problem 2: Use your own words, but remember "to solve" means to find the replacements
that make an equation true, and since there are two variables there will me infinitely
many such replacements. In order to show all of these, it is necessary to draw a graph.
Problem 3: See the slope-intercept form.
Problem 4: Find the box in the text that describes this process.
Problem 5: See Example 8.
Problem 6: See Figure 15.9.
Choose an x-value and then find the corresponding
y-value; write your answer as an ordered pair. See Examples 2 and 3.
Plot the given point, and then count our the rise and
the run to get the slope point; draw the line passing through those points.
See Example 4.
You should recognize horizontal or vertical lines; for the others use the
slope-intercept method. See Examples 5-8.
However, as you go through the book be sure you look at
all the examples in the text. If you need hints for the
Level 3 problems, check some sources for help on the internet
(see the LINKS for that particular section. As a last resort,
you can call the author at (707) 829-0606.
On the other hand, the problems designated "Problem Solving"
generally require techniques that do not have textbook examples.
