Answer
Infinitely many solutions
Work Step by Step
$y=x-7$
$3x-3y=21$
$3x-3*(x-7) = 21$
$3x-3x +21 = 21$
$21 = 21$ (true for all real numbers)
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 6 - Systems of Equations and Inequalities - Chapter Review - 6-2 Solving Systems Using Substitution - Page 405: 16
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