Solve the system of equations by elimination.
x - y = 10
x + 2y = 11
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Solve the problem.The kinetic energy K of a mass is proportional to the square of its velocity v. If K = 7200 joules when 
what is K when v = 8 m/sec?
A. 3520 joules B. 3200 joules C. 3840 joules D. 2560 joules
Mathematics
Use Gauss-Jordan elimination to find the solution. Write the solution as an ordered pair. 5x + y = 27 6x + 2y = 30
A. (6, -6) B. (-3, 6) C. (6, -3) D. (-3, -6)
Mathematics
Find the products AB and BA to determine whether B is the multiplicative inverse of A.A = 
,B = 
A. B ? A-1 B. B = A-1
Mathematics
List the intercepts of the graph. 
A. (3, 0), (1, 0) (-5, 0), (0, 3) B. (3, 0), (0, -3), (0, 1), (0, 5) C. (3, 0), (0, 3), (0, 1), (0, -5) D. (-3, 0), (1, 0), (5, 0), (0, 3)
Mathematics