Math really miss her, huh?

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Across
  1. 2. Constant variation of inverse variation
  2. 4. The missing value of joint variation
  3. 6. Inverse Equation
  4. 8. Vertex Form
  5. 9. General equation of joint variation
  6. 10. Third equaion of joint variation
  7. 12. A term found in almost of the variations
  8. 15. Mathematical statement to inequalities
  9. 16. The variations relating the quantities
  10. 18. Quotient of constant two variables(x,y) is a constant
  11. 19. A variation that one quantity increases and the other decreases
Down
  1. 1. Formula for finding constant in direct variation
  2. 2. Constant of joint variation
  3. 3. Standard form of quadratic functions
  4. 5. Equation of direct variation
  5. 7. Second equation of joint variation
  6. 9. General equation of combined equation
  7. 11. A quantity varies jointly as two or more varbles.
  8. 13. Third step in solving quadratics inequalities
  9. 14. The middle of the parabola
  10. 17. The third equation in direct and inverse. Which we need to find the