Answer
$10$.
Work Step by Step
Multiply -2 to the 1st equation and to the 2nd to get $A-10=0$. For the system to have infinite number of solutions, we need $A=10$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 10 - Systems of Equations and Inequalities - Chapter Review - Review Exercises - Page 815: 53
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