a doggie day care charges $21.50 per day. If you leave your dog 5 days a week the discount is 20%. what is the cost of leaving y
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9 = (3/8)y
Solve for y.
Isolate y by dividing both sides by 3/8, or multiplying by its reciprocal (8/3)
9 · (8/3) = (3/8)y · (8/3)
72 / 3 = y
y = 24