The hyperbola shown has branches opening up and down. Which equation matches?
A y²/a² − x²/b² = 1
B x²/a² − y²/b² = 1
C x²/a² + y²/b² = 1
D x² + y² = r²
Explanation
Vertical opening hyperbola has y² term first (positive), x² subtracted: y²/a² − x²/b² = 1.