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
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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
Solve the proportion.
= 
A. x = 
B. x = 30
C. x = 15
D. x = 
Provide an appropriate response. Use a table of solutions to graph the quadratic equation:y = x2 - 6x + 9
A. 
B. 
C. 
D. 
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, 
= 