Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 1 - Foundations for Algebra - 1-8 An Introduction to Equations - Practice and Problem-Solving Exercises - Page 56: 30



Work Step by Step

This question involves mental math. There is a negative in front of the y, so doing it the traditional way is a bit difficult to do in our head. Thus, we ask ourselves 7 minus what number equals 4. We know that 4+3 is 7, so thus we remember that 7 minus 3 is 4, meaning that y=3.
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