What is the formula for direct and Inverse proportion
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Please give question first.
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direct
X1/Y1=X2/Y2
Inverse
X1/Y2=X2/Y1
X1×Y1 =X2×Y2
X1/Y1=X2/Y2
Inverse
X1/Y2=X2/Y1
X1×Y1 =X2×Y2
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