If y varies jointly as x and z, and y=16 when x=1/2 and z=8 Wat equation represents the joint variation func?

Question

If y varies jointly as x and z, and y=16 when x=1/2 and z=8 Wat equation represents the joint variation function?* Please help me so much this isnt homework but revision sheet for exam.
Thank you
and if you could answer this question too.
Which equation is best represented by following statement: y varies directly as the square root of x?
a) y=k/ squareroot of x  b) y=k/x^2   c) k squareroot of xy   d) y=k squaretoot of x

Damon Lyon · Accepted Answer

Y varies jointly as x and z

y = kxz

16 = k(1/2)(8)
16 = k(4)

4 = k

-------------------

y varies directly as the square root of x

y = k√x

? · Answer

Y = kxz/w² ----> ok = yw²/xz ok = 20(5)²/(-0.5)(4) k = 20(25)/-2 okay = 500/-2 ok = -250 k is the consistent of variant. It can be units is determined by the units of the variables. Y = (-250) xz/w²

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If y varies jointly as x and z, and y=16 when x=1/2 and z=8 Wat equation represents the joint variation func?

2 Answers