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B. Find the equation of variation in which y varies jointly as x and z, and y = 45 when x = 18 and z = 10. find y when x = 20 and z = 30.

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MATTESCARROIN

Step-by-step explanation:

[tex]y = kxz \\ \\ k = \frac{y}{xz} \\ \\ \frac{45}{18(10)} = \frac{y}{20(30)} \\ \\ \frac{45}{180} = \frac{y}{600} \\ \\ 180y = 45(600) \\ \\ 180y = 27000 \\ \\ \frac{180y}{180} = \frac{27000}{180} \\ \\ y = 150[/tex]

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