the system of linear equations below has a unique solution for all but one value of aa: 21x - 42y = 21 176x +  ay = 176 What is this exceptional value for a?

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
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Chapter4: Systems Of Linear Equations
Section4.1: Solve Systems Of Linear Equations With Two Variables
Problem 4.25TI: For each system of linear equations decide whether it would be more convenient to solve it by...
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the system of linear equations below has a unique solution for all but one value of aa:

21x - 42y = 21
176x +  ay = 176

What is this exceptional value for a?

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