Obtain an equivalent system by performing the stated elementary operation on the system.Multiply the second equation by -1. x - 5y + z = 55x - 5y - z = -18 5x + y + 2z = -1 x - 3y + z = -22
A. x - 5y + z = 5
-5x + 5y + z = -18
5x + y + 2z = -1
x - 3y + z = -22
B. -x + 5y - z = -5
5x - 5y - z = -18
5x + y + 2z = -1
x - 3y + z = -22
C. x - 5y + z = 5
-5x - 5y - z = -18
5x + y + 2z = -1
x - 3y + z = -22
D. x - 5y + z = 5
-5x + 5y + z = 18
5x + y + 2z = -1
x - 3y + z = -22
Answer: D
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Find an antiderivative of the given function.2 cos 9x
A. sin 9x
B. 2 sin 9x
C. - 18 sin 9x
D. 
sin 9x
Solve the following system by any appropriate method. If there is no real number solution, so state.y - 9x = 09x2 + y2 = 90
A. (1, 9) B. (-1, -9), (1, 9), (-1, 9), (1, -9) C. (-1, -9), (1, 9) D. (-1, -9)
Provide an appropriate response.Can 
represent a negative real number?
Fill in the blank(s) with the appropriate word(s).
Add.-2 + 3
A. -5 B. -1 C. 5 D. 1