2x+3y=7
(a+b)x+(-2a-b)y=21
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Condition for infinitely many solutions is Solving (i) and (ii), we get a = 5 and b = 1.Read more on Sarthaks.com - https://www.sarthaks.com/778089/if-the-system-of-equations-2x-3y-7-and-a-b-x-2a-b-y-21-has-infinitely-many-solutions-then?show=778092#a778092
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