Solve the system of equations using matrices. Use Gaussian elimination with back-substitution. x + y + z= 2 x - y + 5z=-42x + y + z= 7
A. {(5, -2, -1)}
B. {(-2, -1, 5)}
C. {(5, -1, -2)}
D. {(-2, 5, -1)}
Answer: C
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A. 
B. 
C. 
D. 
Decide whether the slope is positive, negative, zero, or undefined.
A. Negative B. Positive C. Zero D. Undefined
Solve the problem.Of a family's $856 weekly income, $86 usually goes toward groceries. Write a simplified ratio of the amount spent on groceries to weekly income.
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B. 
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D. 
A polynomial P(x) and a divisor d(x) are given. Use long division to find the quotient Q(x) and the remainder R(x) when P(x) is divided by d(x), and express P(x) in the form d(x)? Q(x) + R(x).P(x) = 2x4 - x3 - 15x2 + 3xd(x) = x + 3
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