Read the method of solving the system of equations.

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Solving the first equation for y, we have . Substituting this value of y into the second equation, we have

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The equation is quadratic. We write it in standard form and apply the quadratic formula.

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Use the method shown above to solve the system of equations.

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A. ?
B. ?
C.
D. ?
E. ?


Answer: C

Mathematics

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Write the equation for the plane.The plane through the point A(-5, -9, 6) perpendicular to the vector from the origin to A.

A. -5x - 9y + 6z = -142
B. 5x + 9y - 6z = -142
C. 5x + 9y - 6z =  
D. 5x - 9y - 6z = 8

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Solve the proportion. = 

A. = 
B. = 30
C. = 15
D. = 

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Provide an appropriate response. Use a table of solutions to graph the quadratic equation:y = x2 - 6x + 9

A.

B.

C.

D.

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Solve the problem.Find the center of mass of a tetrahedron of constant density bounded by the coordinate planes and the plane .

A.  =  =  = 1
B.  =  =  = 
C.  =  = 2,  = 
D.  =  = 1,  = 

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