Solve the system by the substitution method.y = 10x - x22x - y = -15
A. (5, 25)
B. (3, 5)
C. (3, 21), (5, 25)
D. (-3, 9), (-5, 5)
Answer: C
Mathematics
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Provide an appropriate response.Write 
in decimal form.
A. 246 B. 24.6 C. 2.46 D. 0.246
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Answer the questionIf y varies directly as x, and x is doubled, how is y changed?
A. y is doubled B. y is halved C. y is increased by 2 D. y is unchanged
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Graph the function.f(x) = 4-x
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 30 seconds with an average speed of 5 feet per second. Find the average speed of the swimmer if it takes 25 seconds to finish the race.
A. 8 feet per second B. 6 feet per second C. 7 feet per second D. 5 feet per second
Mathematics