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2x+y = 5
x = 1/2(5-y)
x² = 1/4(25-10y+y²)
x² = 25/4 - 5/2 y + 1/4 y²
V = π ₀²∫ x² dy
V = π ₀²∫ (25/4 - 5/2 y + 1/4 y²) dy
V = π [ 25/4 y - 5/4 y² + 1/12 y³]²₀
V = π ( 49/6)
V = 8 ¹/₆ π