Example (with steps)1. If x varies jointly as yz and x=8 when y=4,z=3. find x when y=6,z=4
Solution:
`x prop yz`
`=>x=k*yz`
Now, `x=8" when "y=4,z=3`
`=>8=k*4*3`
`=>8=k*12`
`=>k=(8)/(12)`
`=>k=2/3`
Hence, `x=2/3*yz`
we have to find `x" when "y=6,z=4`
`=>x=2/3*6*4`
`=>x=2/3*24`
`=>x=16`
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