Which method should be used to solve the system? Explain your answer, including a description of the first step.x2 - y2 = 16x + 9y = 2
What will be an ideal response?
Substitution should be used, because using elimination would mean introducing an xy term into the second equation unnecessarily. The second equation should be solved for x.
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Solve the system by inspecting the graph of the equations.20x - 4y = -8y = 5x + 2
A. ?
B. 
C. 
D. 
Use the given graph of f(x) = ax2 + bx + c to solve the specified inequality.f(x) ? 0
A. x ? 2 or x ? 5 B. 2 ? x ? 5 C. no solution D. x ? 2
Let (m × n) denote a matrix of size m × n. Find the size of the following product, or state that the product is not defined.(4 × 1)(4 × 1)
A. 1 × 4 B. 4 × 4 C. 4 × 1 D. not defined
Find the zeros of the polynomial function. State whether the graph crosses the x-axis, or touches the x-axis and turns around, at each intercept. f(x) = -x2(x + 4)(x2 - 1)
A. x = 0, touches the x-axis and turns around; x = -4, crosses the x-axis; x = 1, touches the x-axis and turns around B. x = 0, crosses the x-axis; x = -4, crosses the x-axis; x = -1, crosses the x-axis; x = 1, crosses the x-axis C. x = 0, touches the x-axis and turns around; x = -4, crosses the x-axis; x = -1, crosses the x-axis; x = 1, crosses the x-axis D. x = 0, touches the x-axis and turns around; x = 4, crosses the x-axis; x = -1, touches the x-axis and turns around; x = 1, touches the x-axis and turns around