Find dy/dx by implicit differentiation.2y - x + xy = 3
A. - 
B. 
C. - 
D. 
Answer: D
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Suppose u and v are differentiable functions of x. Use the given values of the functions and their derivatives to find the value of the indicated derivative.u(1) = 4, u '(1) = -5, v(1) = 7, v '(1) = -3.
(3v - u) at x = 1
A. 17 B. -14 C. -4 D. 25
Solve the problem.Evaluate 
at t = 6 for the function w(x, y) = ey - ln x; x = t2, y = ln t.
A. 
B. 4
C. - 
D. 
The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using backward substitution.
Write the solution as an ordered triple, if possible.
A. (7, -5, z) 
B. (7 - 6z, -5 + 2z, z) 
C. (7 - z, -5 + z, z) 
D. (7 + 6z, -5 - 2z, z) 
The graph of the derivative function f' is given. Find the critical numbers of the function f.
A. 0.5 B. 1 C. 0 D. 0, 1