Solve the problem using two linear equations in two variables and Cramer's rule.Twice the water flow in the hot-water pipe is the same as three times the flow in the cold-water pipe. The combined flow is 1200 liters/hr. What is the flow in each pipe?
A. 720 liters/hr hot, 480 liters/hr cold
B. 600 liters/hr hot, 400 liters/hr cold
C. 480 liters/hr hot, 720 liters/hr cold
D. 400 liters/hr hot, 600 liters/hr cold
Answer: A
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z = 13
x + 2z = -8x -2y = -4
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