MathII ( Joint and Combined Variation)
posted by jezzaD. on .
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
Please Help!!

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