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Hi
Let x represent number of reserved seating tickets and y the number of general admission tickets
Write as You read:
x + y = 217
$4x + $3y = $726
Substitute
$4x + $3(217 - x) = $726
x = 75
x = 75 number of reserved seating tickets sold
y = 142 the number of general admission tickets sold
CHECKING our answer***
$4(75) + $3(142) = $300 + $426 = $726 checks
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