Solve the system of equations by substitution.
A. x = 3, y = 7.5; (3, 7.5)
B. x = 7.5, y = 10.5; (7.5, 10.5)
C. x = 7.5, y = -10.5; (7.5, -10.5)
D. x = 3, y = -10.5; (3, -10.5)
Answer: C
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Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. 3x - 8y - z = -1 x + 8y + 4z = 32 8x + y + z = 38
A. (-4, 1, 8) B. (4, 1, 5) C. (4, 5, 1) D. No solution
Translate the sentence to an equation.The quotient of a and 4 is 5.
A. 
= 4
B. 
= 5
C. 
= a
D. 
= 5
Write the number in words.While working as a stockbroker, Francois sold securities worth 
last year.
A. Six million, three thousand, one dollars B. Six million, three hundred thousand, one dollars C. Six million, three thousand, one hundred dollars D. Six million, three hundred thousand, one hundred dollars
Establish the identity.sec2 
= 
What will be an ideal response?