Crash Course for the SAT by The Princeton Review

Author:The Princeton Review
Language: eng
Format: epub
Publisher: Random House Children's Books
Published: 2020-03-09T16:00:00+00:00

Answers:

1. Multiply the second equation by (−2) to get −2x −2y = 20. Now add the equations to get −y = 15; y = −15.

2. Add both equations to get 7x + 7y = 21. Divide by 7 to get x + y = 3. Make sure to always check what the question is asking—do not isolate a variable if you don’t need to!

Your Turn—Exercise 6.1

Click here to download a PDF of Exercise 6.1.

11

P = 1,216 − 323n

The equation above estimates the total profit, P, in millions, of a cell phone provider in the nth year after it hires its new CEO. What does the 323 in the equation represent?

A) Every year the number of customers decreases by 323.

B) For every decrease of 323 customers, the company loses $1,216 in profit.

C) Every year the profit of the company decreases by $323,000.

D) Every year the profit of the company decreases by $323,000,000.

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