1. Vocabulary: Chapter Sections: 7.2.1 Topic: Writing an equation from a word problem Slope words: action words like grow or move Y-intercept words: beginning words like starts at or have or begins at or is

2. y 13 12 11 10 9 8 7 6 5 4 3 2 1 0 12345678x Example One Instructions: Find slope and y intercept, then Graph the equation. Slope fraction ½ y-intercept 4 Move 1 up Move 2 over How many days until you have 8 dollars? Every day your money increases by ½ dollar. You start with 4 dollars. days 8 days

3. Classwork One. Instructions: Find the slope and y-intercept. Graph the line. What do x and y mean? How much will you have after you work for 5 hours? You earn ⅖ dollars each hour. You have 5 dollars. The bathtub starts out 3 inches deep. Every second a bathtub gets ½ inch more water. How deep will the tub be after 15 seconds? How tall will it be 12 years from now? It grows ⅓ foot each year. A tree is 7 feet tall. How much will you have spent on chips at the end of 4 more days? So far this week you have spent 2 dollars. Every day you spend ½ dollar on chips.

4. y 65 60 55 50 45 40 35 30 25 20 15 10 5 0 12345678x Example One Instructions: Graph the equation. Slope -5 y-intercept 30 Move 5 down each time How many days until you spend all your money? Every day you spend 5 dollars. You start with 30 dollars. y means dollars x means days 6 days

5. Classwork One. Instructions: Find the slope and y-intercept. Graph the line. What do x and y mean? He starts with 900 dollars. How many days until the pool is empty. How many months until you owe nothing? How many months until he is out of money? A man spends 100 dollars every month. If the water level goes down by 1 foot every day. And the water in the pool starts at 7 feet deep. Every month you pay him 50 dollars.? You owe a man 450 dollars. A pile is 36 boxes high. How many minutes until the pile is gone? Every minute you take away 4 boxes.

6. y 13 12 11 10 9 8 7 6 5 4 3 2 1 0 12345678 9 11 12x Example Three Instructions: Graph the equation. Slope ⅔ y-intercept 8 Move 2 down Move 3 over How many days until you have spent all your money? Every day you spend ⅔ dollars. You start with 8 dollars. days 12 days

7. Classwork Three. Instructions: Find the slope and y-intercept. Graph the line. What do x and y mean? The pile starts out 40 boxes high. How far away will the train be after 4 minutes? After how many hours will the get here? How tall will the tree be in 2 years? Every month you pay 40 dollars more. Every minute a pile of boxes gets 5 boxes higher. How high will the pile be after 7 minutes? Every year it grows ⅘ feet taller A tree is 20 feet tall today, Every minute it gets ½ mile closer. A train starts 5 miles away. If it started out 120 miles north of here. A ship moves 20 miles south every hour. The cost of a metro phone is 120 dollars. After how many months will you have spent 360 dollars on your phone?