Solve the system of equations using substitution.
A. x = 1 , y = 1 or 
B. x = 
, y = 2; x = 1, y = 1
or 
, 
C. x = -2 , y = 2; x = -1, y = 1
or (-2, 2), (-1, 1)
D. x = 2 , y = 
; x = 1, y = 1
or 
, 
Answer: B
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Prepare a probability distribution for the experiment. Let x represent the random variable, and let P represent the probability.Two marbles are drawn from a bag in which there are 4 red marble and 2 blue marble. The number of blue marbles is counted.
A. 
B. 
C. 
D. 
Solve the problem.A boat heads upstream a distance of 30 miles on the Mississippi river, whose current is running at 5 miles per hour. If the trip back takes an hour less, what was the speed of the boat in still water? Give the answer rounded to two decimal places, if necessary.
A. 16.58 mph B. 6 mph C. 15 mph D. 18.03 mph
Determine whether the graph of the equation is symmetric with respect to the x-axis, the y-axis, and/or the origin.9x2 + 16y2 = 144
A. y-axis B. x-axis C. origin D. x-axis, y-axis, origin E. none
Solve the problem.Paul Nagel invested some money at 4.5% simple interest and $1000 more than that amount at 3% simple interest. After 1 year, his total interest from the two accounts was $1380. How much did he invest at each rate?
A. $18,000 at 4.5%; $19,000 at 3% B. $18,000 at 4.5%; $20,000 at 3% C. $19,000 at 4.5%; $19,000 at 3% D. $19,000 at 4.5%; $18,000 at 3%