Math Problem Statement
yがxに反比例し、x=4のとき、y=9である。y=12のとき、xの値を求めよ。
Solution
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Math Problem Analysis
Mathematical Concepts
Algebra
Inverse Proportionality
Formulas
y = k / x
k = y * x
Theorems
Inverse Proportionality Theorem
Suitable Grade Level
Grades 8-10
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