# Math-II ( Joint and Combined Variation)

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1. R varies jointly as S and t. If R=1/6,S=1/8 and T=3, find R when S=2 and T=11.

formula: R=KST

2. U varies jointly as L and H and inversely a S. If U=1.8, L=6.4, H=1.5 and S=-7.2, find U when L=4.3, H=5.1 and S=-2.2.

formula: U=KLH/S

• Math-II ( Joint and Combined Variation) -

1.
R=KST, so K = R/ST = (1/6)/[(1/8)(3)] = 4/9

R = 4/9 ST = (4/9)(2)(11) = 88/9

2.
U=KLH/S, so K = US/LH = (1.8)(-7.2)/[(6.4)(1.5)] = -1.35

U = -1.35(4.3)(5.1)/-2.2 = 13.457

• Math-II ( Joint and Combined Variation) -

thanks! so my answer in number 1 was correct, number 2 is still not answered but ya help me. again, thanks to ur help!!

• Math-II ( Joint and Combined Variation) -

ass

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