Solve the system by the substitution method.x2 + y2 = 41x + y = 9
A. {(5, 4), (4, 5)}
B. {(-5, -4), (-4, -5)}
C. {(5, -4), (4, -5)}
D. {(-5, 4), (-4, 5)}
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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Factor by grouping.12x2 - 10x + 18x - 15
A. (12x + 3)(x - 5) B. (2x + 3)(6x - 5) C. (12x - 3)(x + 5) D. (2x - 3)(6x + 5)
Mathematics
Solve for x. Be sure to reduce your answer. Check your solution.-2x = 12
A. x = -6 B. x = 1 C. x = -14 D. x = 14
Mathematics
Solve.A loaded moving truck is traveling 20 mph faster than a freight train. In the time it takes the train to travel 60 miles, the truck travels 100 miles. Find the speed of the truck.
A. 50 mph B. 10 mph C. 20 mph D. 100 mph
Mathematics