Find an equation for the line. Then write your answer in the form 
With y-intercept 2 and slope 3
A. y = 2x + 3; 2x - y - 3 = 0
B. y = 3x - 2; 3x - y - 2 = 0
C. y = 2x + 3; 2x - y + 3 = 0
D. y = 3x + 2; 3x - y + 2 = 0
Answer: D
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Match the differential equation with the appropriate slope field.y' = 
A. 
B. 
C. 
D. 
Describe the domain of the function of three or more varables.f(w, x, y, z) = 
A. All points in ?4 that satisfies w2 + x2 + y2 + z2 ? 0. B. All points in ?4. C. All points in ?4 except the origin (0, 0, 0, 0). D. All points in ?4 that satisfy w > 0, x > 0, y > 0, z > 0.
Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 
C. 
D. 
Solve the system. If the system has infinitely many solutions, write the solution set with x arbitrary. 5x - y + z = 8 7x + y + z = 612x + 2z = 14
A. {(x, -x + 1, 6x + 7)} B. {(x, -x - 1, -6x + 7)} C. {(x, -x + 1, 6x - 7)} D. {(x, -x + 1, -6x + 7)}