1. B varies jointly as P and X. When B is 12, P= 10 and X = 240. What is the value of the constant k? *
2. If z varies jointly as x and y and z = 10 when y= 5 and x = 20, find z when x = 8 and y =40.
3. y varies directly as x , and y = 10 when x = 5. What is the value of the constant? *
4. y is inversely proportional to x , and y = 12 when x = 6. What is the value of the y when x is 8? *
5. y varies directly as x , and y = 120 when x = 36. What is the value of y when x = 30? *
2. If z varies jointly as x and y and z = 10 when y= 5 and x = 20, find z when x = 8 and y =40.
3. y varies directly as x , and y = 10 when x = 5. What is the value of the constant? *
4. y is inversely proportional to x , and y = 12 when x = 6. What is the value of the y when x is 8? *
5. y varies directly as x , and y = 120 when x = 36. What is the value of y when x = 30? *
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Answer:
2. z = 32
3. k = 2
4. y = 9
5. y = 100
Step-by-step explanation:
1. b = kpx
12 = k(10)(240)
12 = 2,400k
2. z = kxy
10 = k(20)(5)
10 = 100k
z = 32
3. y = kx
10 = 5k
2 = k
72 = k
y = 9
5. y = kx
120 = 36k
y = 100
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