If z varies jointly with x and y, x = 2 and y = 2, z = 7. Find z when x = 4 and y = 8.
1 answer:
Answer:
56
Step-by-step explanation:
z varies jointly with x and y:
z = kxy
When x = 2 and y = 2, z = 7.
7 = k(2)(2)
k = 7/4
z = 7/4 xy
When x = 4 and y = 8:
z = 7/4 (4)(8)
z = 56
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