Linear Equations and Problem Solving 3.5 DRAWING A DIAGRAM 1 GOAL EXAMPLE 1
Extra Example 1 A page of pictures for a yearbook is inches by 11 inches. The top margin is inch and the bottom margin is inches. The space between the pictures is inch. How high can each picture be to fit seven down the length of the page? Click to see the solution
Checkpoint Three pictures that are each inches wide are to be placed on a page that is inches wide. If you leave equal space between pictures, how much space can you put between them if the left margin is inch and the right margin is inches?
Linear Equations and Problem Solving 3.5 2 USING TABLES AND GRAPHS AS CHECKS GOAL EXAMPLE 2
Extra Example 2 At West High School, 362 students take Spanish. This number has been increasing at a rate of 20 per year. The number of students taking French is 259 and has been decreasing at a rate of about 3 per year. At these rates, when will there be two times as many students taking Spanish as taking French? Click to see the solution
EXAMPLE 3 Checkpoint At North High School, 176 students buy non-spiral notebooks from the school store. This number has been increasing at a rate of about 24 per year. The number of students buying spiral notebooks is 331 and has been decreasing at a rate of about 15 per year. At these rates, when will the number of spiral notebooks sold be half the number of non-spiral notebooks sold? It will take 9 years.
Extra Example 3 Jim can run 11 ft/sec and Sarah can run 13 ft/sec. How far ahead of Sarah must Jim be not to fall behind Sarah in the first 15 seconds that they run? Click to see the solution
Checkpoint The winning speed at the Indianapolis 500 auto race in 1990 was about 186 mi/h. The winning speed in 1997 was 146 mi/h. About how many hours longer was the race in 1997 than in 1990? It was approximately 0.74 hours (44 minutes) longer in 1997 than in 1990.