Unit 3 - Lesson 14 - Grade 8: Illustrative Mathematics

Grapes cost $2.39 per pound. Bananas cost $0.59 per pound. You have $15 to spend on g pounds of grapes and b pounds of bananas.

A savings account has $50 in it at the start of the year and $20 is deposited each week. After x weeks, there are y dollars in the account.

Choose one line and write a description of what happens to that person's account over the first 17 weeks of the year. Do not tell your group which line you chose.

Write an equation for each line on the graph.

What do the slope, m, and vertical intercept, b, in each equation mean in the situation?

For which equation is (1, 70) a solution? Interpret this solution in terms of your story.

Predict the balance in each account after 20 weeks.

What are five different combinations of salmon and tilapia that the market can order?

Define variables and write an equation representing the relationship between the amount of each fish bought and how much the market spends.

Which of these combinations can the market order? Explain or show your reasoning.