If x² + y² = 25, then dy/dx is?
A
-x/y
B
-y/x
C
x/y
D
y/x
Analysis & Theory
Differentiating: 2x + 2y(dy/dx) = 0 ⇒ dy/dx = -x/y.
If xy = 1, then dy/dx is?
A
-y/x
B
-1/x²
C
1/x
D
y/x
Analysis & Theory
Differentiating: x(dy/dx) + y = 0 ⇒ dy/dx = -y/x.
If x²y + y² = 1, then dy/dx is?
A
-(2xy)/(x²+2y)
B
-(2x+y)/(x²+2y)
C
-(2x+2y)/(x²+2y)
D
-(2x²)/(y+1)
Analysis & Theory
Differentiate: (2xy + x²(dy/dx)) + 2y(dy/dx) = 0 ⇒ dy/dx = -(2xy)/(x²+2y).
If sin(x + y) = x, then dy/dx is?
A
(1 - cos(x+y))/(cos(x+y))
B
(1 - cos(x+y))/(1 + cos(x+y))
C
(1 - cos(x+y))/(cos(y))
D
(1 - cos(x+y))/(cos(x))
Analysis & Theory
Differentiate: cos(x+y)(1 + dy/dx) = 1 ⇒ dy/dx = (1 - cos(x+y))/cos(x+y).
If e^(x+y) = x, then dy/dx is?
A
(1 - e^(x+y))/e^(x+y)
B
(e^x - 1)/x
C
(1 - x)/y
D
(e^(x+y)-1)/e^(x+y)
Analysis & Theory
Differentiate: e^(x+y)(1 + dy/dx) = 1 ⇒ dy/dx = (1 - e^(x+y))/e^(x+y).
If x³ + y³ = 6xy, then dy/dx is?
A
(2y - x²)/(y² - 2x)
B
(2y - x²)/(y² + 2x)
C
(2x - y²)/(x² - 2y)
D
(2x - y²)/(y² - 2x)
Analysis & Theory
Differentiate: 3x² + 3y²(dy/dx) = 6y + 6x(dy/dx) ⇒ dy/dx = (2y - x²)/(y² - 2x).