Calculus Help Please!!!

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Use implicit diff. to find dy/dx of each of the following. In the following x,y and (a) are all variables. Show step by step please! Thank you!

1) y^2 = x^2+a^2

2) y^2+ay = x^2+ax+a^2

  • Calculus Help Please!!! -

    2 y dy/dx = 2 x + 2 a da/dx

    y dy/dx = (x+a da/dx)

    dy/dx = (x + a da/dx)/y
    dy/dx = (x + a da/dx)/(x^2+a^2)^.5

    2 y dy/dx + a dy/dx + y da/dx = 2 x^2 + a + x da/dx + 2 a da/dx

    (2y+a)dy/dx = 2 x^2 +a +(x-y+2a)da/dx

    dy/dx = [2 x^2 +a +(x-y+2a)da/dx]/(2y+a)

  • Calculus Help Please!!! -

    I suspect in each, a is a constant, so da/dx=0

  • Calculus Help Please!!! -

    I figured the same but he said specifically that a was variable.

  • Calculus Help Please!!! -

    My answers were like these







    And my teacher said I made mistakes with my answers but I couldn't figure out.

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