Find all real solutions to the system of equations using the substitution method.x2 - y2 = 39x - y = 3
A. (8, 5)
B. (8, -5)
C. (-8, -5)
D. (-8, 5)
Answer: A
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Determine whether or not the equation is linear.0.03x + 0.07x = 0.40
A. Linear B. Not linear
Solve using matrices. -2x - y - 3z = -19-6x + 7y - 7z = -3 -9x - 7y + z = -69
A. (-4, 5, 8) B. (4, 2, 5) C. (8, 5, -4) D. (4, 5, 2)
Solve the problem.A box with an open top is formed by cutting squares out of the corners of a rectangular piece of cardboard and then folding up the sides. If x represents the length of the side of the square cut from each corner, and if the original piece of cardboard is 18 inches by 11 inches, what size square must be cut if the volume of the box is to be 180 cubic inches? 
A. 2 in. by 2 in. square B. 12 in. by 12 in. square C. 3 in. by 3 in. square D. 5 in. by 5 in. square
Solve. Use the fact that the radius of the Earth is 3960 miles and 1 mile = 5280 feet.A person who is 6 feet tall is standing on the beach and looks out onto the ocean. Suddenly, a ship appears on the horizon. How far is the ship from the shore? Round to the nearest tenth of a mile.
A. 5600.3 mi B. 4.2 mi C. 3 mi D. 218.1 mi