Answer
$\left\{\begin{array}{l}
x+y=40\\
x=2y
\end{array}\right.$
Work Step by Step
(1) She exercises for 40 minutes in all $\qquad x+y=40$
(2) $x$ is twice as much time as $y:\qquad x=2y$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 6 - Systems of Equations and Inequalities - 6-2 Solving Systems Using Substitution - Apply What You've Learned - Page 377: b
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